8th Grade Science. Alaska Content and Performance Standards Alaska Content and Performance Standards

Alaska Content and Performance Standards for Eighth Grade Science

Our Solar SystemThe Sun is by far the most massive object in the Solar System, therefore gravitationally dominating all other members of the Solar System. The Sun is a star that gives off radiant energy that drives Earth systems and is essential for life. The Solar System consists of comets, asteroids, planets, and their respective satellites, most of which orbit the Sun on a plane called the ecliptic. The planets in our Solar System revolve in the same direction around the Sun in elliptical orbits that are very close to being in the same plane. Read more...iWorksheets: 3

Stars, Galaxies and the UniverseStars do not just exist randomly throughout the universe. They are clustered in large groups. Large groups of stars in space are called galaxies. Our galaxy is called The Milky Way. Astronomers estimate that there are from 200 billion to 400 billion stars in the Milky Way. Read more...iWorksheets: 3Study Guides: 1Vocabulary Sets: 3

The Movement of Ocean WaterThe crest of a wave is the highest point of the wave. The lowest point of a wave is the trough. The distance between two adjacent crests is the wavelength. The wave height or wave amplitude is the distance from the crest to the trough. The wave frequency is the number of waves that pass a given point each second. Read more...iWorksheets: 3Study Guides: 1Vocabulary Sets: 2

EarthquakesAn earthquake is the result of a release of stored energy in the Earth's crust that creates seismic waves. Seismographs are machines that detect and measure seismic waves caused by earthquakes. P waves, or primary seismic waves, are the fastest moving waves. They travel through solids, liquids and gases. S waves or secondary waves are slower and can travel through solids, but not liquids. The slowest and most destructive seismic waves are called surface waves. Read more...iWorksheets: 3Vocabulary Sets: 4

FossilsAncient life forms have been preserved, in part and in whole, in the rock record. These preserved pieces of ancient life forms are called fossils. Fossils found in limestone are usually formed by a process called cast and mold. Petrified wood is formed by a process called petrification. In very hot, arid environments, flesh can be dried out and preserved indefinitely. This process is called mummification. Read more...iWorksheets: 5Study Guides: 1Vocabulary Sets: 2

Geologic timeAge of the Earth is 4.6 billion years. Geologic time scale is a map that divides Earth history into logical segments of time. The geologic time scale is broken into divisions and subdivisions. The divisions are called eons. Eons are divided into eras, eras are divided into periods, and periods are divided into epochs. Read more...iWorksheets: 5Study Guides: 1

MineralsA mineral, by definition, must meet four criteria. It must: be a naturally occurring substance, be a solid substance, have an internal crystal structure and have been formed by inorganic processes (in other words, it cannot be formed by an organism). A rock, by comparison, is composed of one or more minerals or organic material (such as coal). Read more...iWorksheets: 5Study Guides: 1Vocabulary Sets: 3

Plate tectonicsThe Earth is a dynamic planet. Its interior is actually in motion! The crust on its surface is also in motion. It was not until the 20th century that geologists truly began to understand Earth's dynamic movements. New theories, supported by ever-improving technologies, have made it possible to more clearly understand the forces working within the planet we call home. Read more...iWorksheets: 5Study Guides: 1Vocabulary Sets: 7

RocksTypes of Rocks: Metamorphic: formed when igneous or sedimentary rocks are put under heat and/or pressure in the Earth's crust. Igneous: Formed when crystallized through melting and cooling. Sedimentary: Formed through the accumulation of sediment. Compaction - process by which overlying pressure from rocks and soil reduces the size or volume of sediments. Rock cycle - the continental process by which rocks can be changed into different types. Read more...iWorksheets: 3Vocabulary Sets: 3

VolcanoesEarth's crust is fractured into 13 major and approximately 20 total lithospheric plates. Most of the Earth's volcanoes are located at lithospheric plate boundaries. The belt of volcanoes along the boundary of the Pacific Ocean is called the Ring Of Fire because it contains about 75% of the world's active volcanoes. Why does a volcano erupt? When magma rises towards the surface, gas bubbles expand and increase in pressure. The force of the gas pushes the magma out of the vent and causes an eruption. Read more...iWorksheets: 3Vocabulary Sets: 3

Understanding WeatherThe global winds in the Northern hemisphere curve to the right. The global winds in the Southern hemisphere curve to the left. One would expect them to travel in a straight line, but the Earth’s rotation on its axis causes them to curve. This is due to the Coriolis effect. Read more...iWorksheets: 5Study Guides: 1Vocabulary Sets: 3

Bones, muscles, and skinFreeThe human body works very smoothly carrying out its daily functions because it is organized. The human body has different levels of organization that consist of cells(the smallest), tissues, organs, and organ systems (the largest). Read more...iWorksheets: 3Study Guides: 1Vocabulary Sets: 7

Circulation and immunityThe circulatory system, otherwise known as the cardiovascular system, consists of the heart, blood vessels, and blood. The heart has two separate sides, the right and left, which are separated by the septum. The septum prevents oxygen-rich blood from mixing with oxygen-poor blood. The valve prevents blood from flowing backwards in the one-way direction of the circulatory system. There are three types of blood vessels in the human body: arteries, capillaries, and veins. Read more...iWorksheets: 3Study Guides: 1Vocabulary Sets: 7

Respiration and excretionAir travels through the nose, pharynx, trachea, and the bronchi within the lungs. Oxygen is gained by the respiratory system and glucose is gained from the digestive system. Both the oxygen and glucose are transported around the body by the circulatory system. With every breath, we pull oxygen out of the atmosphere. The atmosphere consists of 78% nitrogen, 21% oxygen, and 1% other gases, so the air that we breathe is not all taken into the body. Read more...iWorksheets: 3Study Guides: 1Vocabulary Sets: 4

The Digestive System & NutritionThere are six different types of nutrients that the body needs. They are carbohydrates, fats, proteins, minerals, vitamins, and water. There are three main functions of the digestive system. They are to break down foods into molecules that the body can use, absorb the molecules into the blood and send them all throughout the body, and eliminate wastes from the body. Read more...iWorksheets: 3Study Guides: 1Vocabulary Sets: 5

The Endocrine system and ReproductionThe endocrine system controls long-term and short-term changes of the body and many of the daily activities of the body. The system is made up of glands, which are organs that produce and secrete chemicals. Endocrine glands release chemicals called hormones into the bloodstream, which will then be carried throughout the body. The hypothalamus is a small part of the brain that links the nervous system and the endocrine system together. Read more...iWorksheets: 3Study Guides: 1Vocabulary Sets: 5

The nervous systemThe nervous system gathers information from inside and outside of the body, responds to the information that it gathers and helps to maintain homeostasis. There are three different types of neurons: sensory neurons, interneurons, and motor neurons. The three different types of neurons will work together to carry messages all throughout the nervous system. Read more...iWorksheets: 3Study Guides: 1Vocabulary Sets: 6

The Evolution and interaction of Living ThingsOver 3.5 billion years ago, the Earth was much different than it is today. Scientists believe that early Earth’s atmosphere was made up of nitrogen, water vapor, carbon dioxide, and methane. All of these gases are still on Earth today, but in different quantities. The gases in Earth's atmosphere include: Nitrogen - 78 percent, Oxygen - 21 percent, Argon - 0.93 percent, Carbon dioxide - 0.04 percent, Trace amounts of neon, helium, methane, krypton and hydrogen, as well as water vapor. Read more...iWorksheets: 3Study Guides: 1Vocabulary Sets: 2

Modern GeneticsThe main function of a gene is to regulate the production of proteins within cells. Proteins establish the phenotype, physical characteristics, and many other traits of a particular organism. Recall from Topic 5 that DNA is made up of 4 different nitrogen bases, Adenine (A), Thymine (T), Guanine (G), and Cytosine (C). Read more...iWorksheets: 5Study Guides: 1Vocabulary Sets: 6

Heat and heat technologyAll matter is made up of particles that vibrate with kinetic energy. This movement of particles occurs even when the temperature goes well below zero. When we use the term temperature, we are referring to the amount of thermal energy that a substance has. Thermal energy is the sum of the energy of the moving particle and the potential energy of the resting particles. Read more...iWorksheets: 3Study Guides: 1Vocabulary Sets: 1

The energy of wavesWhen a disturbance transfers energy from one place to another, this is referred to as a wave. Most waves, except for electromagnetic waves, require a substance or medium through which they can travel. This medium could be a solid, liquid or vapor like air. Waves requiring a medium are called mechanical waves. Amplitude: the maximum distance that the medium particles move away from their resting position when a wave is passing through. Read more...iWorksheets: 3Study Guides: 1Vocabulary Sets: 2

Forces in fluidsPressure is calculated by dividing force by area and is measured in units called pascals. For an example, if a force of 10 newtons was exerted over an area of 2 square centimeters, the pressure would be 5 pascals. In fluids, which are substances that can flow, pressure is the sum of each of the forces of each particle in the fluid. Examples of fluids include liquids such as water and gases such as air and helium. Read more...iWorksheets: 3Study Guides: 1Vocabulary Sets: 2

LightWhen light hits an object, it either goes through easily, partially, or not at all. An object that lets most of the light through is said to be transparent. The colors we see depend upon which wavelengths of visible light get reflected back to our eyes. Objects appear white when they reflect all of light’s wavelengths and conversely, they look black when they reflect little or none of the wavelengths. This is why it is wise to wear light-colored clothing in the summer; your clothing doesn’t absorb the light. Read more...iWorksheets: 5Study Guides: 1Vocabulary Sets: 2

Mirrors and lensesThe reflection of light can occur in different ways. Since a mirror has a very smooth surface, all the light bouncing off of a mirror reflects in a regular manner. Read more...iWorksheets: 3Study Guides: 1Vocabulary Sets: 2

SoundSound is a type of longitudinal wave. As it travels through its medium, the mediums particles show areas of compression and rarefaction. Sound, at room temperature, normally travels at a speed of 343m/s. At different temperatures, sound travels at different speeds. The speed of sound is also influenced by the density and elasticity of the medium. When the frequency of sound changes as its source moves in relationship to someone listening, this is called the Doppler Effect. Read more...iWorksheets: 5Study Guides: 1Vocabulary Sets: 2

Chemical bondingFreeChemical bonding involves only an atom's outermost electrons. These electrons are called valence electrons and because they have more energy than other electrons, they tend to be found further away from the nucleus. Read more...iWorksheets: 3Study Guides: 1Vocabulary Sets: 1

Chemical reactionsWhen a chemical reaction occurs, the original substances put together, called reactants, lose their chemical properties and become different substances called products with a different set of chemical properties. Reactions where energy is released are called exothermic reactions. When energy is absorbed, it is called an endothermic reaction. Read more...iWorksheets: 5Study Guides: 1Vocabulary Sets: 2

Organic compoundsOrganic chemistry is the study of carbon compounds. Because there are so many of these in living things, organic chemistry is sometimes thought of as living chemistry. Read more...iWorksheets: 3Study Guides: 1Vocabulary Sets: 2

Introduction to physical scienceSafety First! Working with flames, chemicals and glassware poses many potential dangers. You should learn about safety equipment such as eye goggles, eye washes, fire blankets and fire extinguishers. In addition, while working in the lab, you should be aware of laboratory safety rules as well as familiar with the many safety symbols that often appear in the instructions that are printed for lab activity. Read more...iWorksheets: 3Study Guides: 1Vocabulary Sets: 1

Properties of atomsThe modern atomic model suggests that an atom has two particles in the nucleus, a proton and a neutron or neutrally charged particle. All the mass of an atom is made up with these particles. The total number of protons and neutrons in an atom is called atomic mass while the number of protons is called the atomic number. Read more...iWorksheets: 5Study Guides: 1Vocabulary Sets: 2

AK.B1. Concepts of Physical Science (SB1, SB2, SB3, SB4)

[8] SB1.1. The student demonstrates an understanding of the structure and properties of matter by using physical and chemical properties (i.e., density, boiling point, freezing point, conductivity, flammability) to differentiate among materials (i.e., elements, compounds, and mixtures).

States of MatterThere are Four states of matter observable in everyday life: solid, liquid, gas, and plasma. Matter in the solid state has a fixed volume and shape, with component particles (atoms, molecules or ions) close together and fixed into place. Matter in the liquid state has a fixed volume, but has a variable shape that adapts to fit its container. Its particles are close together but move freely. Matter in the gaseous state has both variable volume and shape, adapting both to fit its container. Its particles are neither close together nor fixed in place. Matter in the plasma state has variable volume and shape. Read more...iWorksheets :3

[8] SB2.1. The student demonstrates an understanding of how energy can be transformed, transferred, and conserved by identifying the initial source and resulting change in forms of energy in common phenomena (e.g., sun to tree to wood to stove to cabin heat).

[8] SB3.1. The student demonstrates an understanding of the interactions between matter and energy and the effects of these interactions on systems by exploring changes of state with increase or decrease of particle speed associated with heat transfer. (L)

Matter and EnergyMatter is any substance that has mass and takes up space. Energy can be transferred as heat or as work. Energy is a property that matter has. Read more...iWorksheets :3

[8] SB3.2. The student demonstrates an understanding of the interactions between matter and energy and the effects of these interactions on systems by exploring through a variety of models (e.g., gumdrops and toothpicks) how atoms may bond together into well defined molecules or bond together in large arrays. (L)

Chemical Formulas and BondingWorksheets :3

Organic ChemistryWorksheets :3

AK.C1. Concepts of Life Science (SC1, SC2, SC3)

[8] SC1.1. The student demonstrates an understanding of how science explains changes in life forms over time, including genetics, heredity, the process of natural selection and biological evolution by describing the role of genes in sexual reproduction (i.e., traits of the offspring).

Nucleic acids and protein synthesisThe term nucleic acid is the name for DNA and RNA. They are composed of nucleotides. DNA molecules are double-stranded and RNA molecules are single-stranded. To initiate the process of information transfer, one strand of the double-stranded DNA chain serves as a template for the synthesis of a single strand of RNA that is complementary to the DNA strand. Read more...iWorksheets :4Vocabulary :3

[8] SC2.1. The student demonstrates an understanding of the structure, function, behavior, development, life cycles, and diversity of living organisms by placing vertebrates into correct classes of taxonomy based on external, observable features.

Vertebrates IVertebrates - animals that have a backbone. The word comes from vertebrae, the bones that make up the spine. Five main groups of vertebrates: fish, birds, reptiles, amphibians and mammals. A few tens of thousands of species have been identified. Read more...iWorksheets :3Vocabulary :3

Vertebrates IIA vertebrate is an animal with a spinal cord surrounded by cartilage or bone. The vertebrates are also characterized by a muscular system consisting primarily of bilaterally paired masses and a central nervous system partly enclosed within the backbone. The 7 classes of vertebrates are: Class Aves, Class Reptilia, Class Agnatha, Class Amphibia, Class Mammalia, Class Osteichthyes, Class Chondrichthyes. Read more...iWorksheets :3Vocabulary :3

[8] SC2.2. The student demonstrates an understanding of the structure, function, behavior, development, life cycles, and diversity of living organisms by explaining that most organisms utilize inherited and learned behaviors to meet the basic requirements of life.

Introduction to animalsClassification - the process of grouping items together according to their similarities. Kingdom - large category included in scientific classification system and the taxonomic category above phylum; scientists recognize six kingdoms: animals, plants, fungi, protista, eubacteria, and archaebacteria. Vertebrates - animals that have a backbone; five main groups of vertebrates: fish, birds, reptiles, amphibians and mammals. Read more...iWorksheets :4Vocabulary :3

[8] SC2.3. The student demonstrates an understanding of the structure, function, behavior, development, life cycles, and diversity of living organisms by describing the functions and interdependence of human body systems (i.e., circulatory, respiratory, nervous).

Human biology IBronchi - large tubules that branch from the trachea to carry air in and out of the lungs. Capillaries - the smallest blood vessels found in very rich networks between arteries and veins; the site where many substances are exchanged. Antibodies - a specific protein produced by B lymphocytes that attaches to an antigen and leads to its removal. Read more...iWorksheets :4Vocabulary :7

Human biology IIAntigen - a molecule that the immune system recognizes as part of the body or foreign to the body. Appendicular skeleton - a part of the skeleton composed of 126 bones found in the flexible regions of the body, including shoulders, hips and limbs. Axial skeleton - the central, anchoring part of the bony skeleton that consists of the skull, backbone (vertebrae) and rib cage. Bile - a chemical produced by the liver and stored temporarily in the gall bladder that is released into the intestines to help in fat digestion. Read more...iWorksheets :3Vocabulary :7

[8] SC3.1. The student demonstrates an understanding that all organisms are linked to each other and their physical environments through the transfer and transformation of matter and energy by stating that energy flows and that matter cycles but is conserved within an ecosystem.

Ecology IMatch each ecology term to its definition like Energy pyramid, Decomposer, Carnivore, Ecosystem, Owl pellet, Omnivore and many more. Which human activity would be more likely to have a positive/negative impact on the environment? Which factor determines the type of terrestrial plants that grow in an area? Which energy transfer is least likely to be found in nature? Read more...iWorksheets :4Vocabulary :2

Ecology IIMatch each Ecology term to its definition like Trophic level, Food web, Consumer, Energy, Herbivore and more. Which component is not recycled in an ecosystem? Why Vultures, which are classified as scavengers, are an important part of an ecosystem? Which characteristic does creeping vine that is parasitic on other plants shares with all other heterotrophs? Read more...iWorksheets :3Vocabulary :2

[8] SC3.2. The student demonstrates an understanding that all organisms are linked to each other and their physical environments through the transfer and transformation of matter and energy by organizing a food web that shows the cycling of matter.

AK.SB. Concepts of Physical Science: A student should understand and be able to apply the concepts, models, theories, universal principles, and facts that explain the physical world. A student who meets the content standard should:

SB1. Develop an understanding of the characteristic properties of matter and the relationship of these properties to their structure and behavior.

Elements - Set IIWorksheets :3

SB2. Develop an understanding that energy appears in different forms, can be transformed from one form to another, can be transferred or moved from one place or system to another, may be unavailable for use, and is ultimately conserved.

SB3. Develop an understanding of the interactions between matter and energy, including physical, chemical, and nuclear changes, and the effects of these interactions on physical systems.

Kinetics and EquilibriumWorksheets :3

Chemical ReactionsChemical reaction is a process in which one or more substances, are converted to one or more different products. Synthesis - a chemical reaction where two or more elements or compounds combine to form a single product. Single Replacement Reaction - a chemical reaction where a more active element replaces a less active element in a compound. Decomposition - a chemical reaction in which a compound is broken down into simpler compounds or elements. Read more...iWorksheets :6Vocabulary :3

AK.SC. Concepts of Life Science: A student should understand and be able to apply the concepts, models, theories, facts, evidence, systems, and processes of life science. A student who meets the content standard should:

SC1. Develop an understanding of how science explains changes in life forms over time, including genetics, heredity, the process of natural selection, and biological evolution.

Genetics and heredity IHow many chromosomes would normally be contained in a gamete? Match each Genetics and heredity term to its definition like Genetic code, Crossing-over, Fertilization, Codon, Dominant allele, Ribosomes, Sex cells, Punnett square, Prophase II. Read more...iWorksheets :4Vocabulary :7

Genetics and heredity IIBy whom were first described the principles of dominance, segregation, and independent assortment? What did Gregor Mendel discover using the results of his experiments with plant crosses? Match each Genetics and heredity term to its definition like Splindle fibers, Telophase, Trait, Transcription, Mutation, Phenotype. Read more...iWorksheets :3Vocabulary :7

Evolution and classificationCategorize organisms using a hierarchical classification system based on similarities and differences. Evolutionary theory is a scientific explanation for the unity and diversity of life. Analyze the effects of evolutionary mechanisms, including genetic drift, gene flow, mutation and recombination. Read more...iWorksheets :3

SC2. Develop an understanding of the structure, function, behavior, development, life cycles, and diversity of living organisms.

SC3. Develop an understanding that all organisms are linked to each other and their physical environments through the transfer and transformation of matter and energy.

AK.SG. History and Nature of Science: A student should understand the history and nature of science. A student who meets the content standard should:

SG1. Develop an understanding that historical perspectives of scientific explanations demonstrate that scientific knowledge changes over time, building on prior knowledge.

Introduction to cellsAll living things are made from one or more cells. The nucleus is the control center of the cell. It houses the nucleolus and genetic material (chromatin) used for directing cell functions. Nuclear pores allow materials to pass in and out of the nucleus. The nuclear envelope is a membrane which surrounds and protects the nucleus. The nucleolus produces ribosomes. Ribosomes are factories that produce proteins needed by the cell. Lysosomes contain chemicals (enzymes) that break down and recycle harmful materials. Read more...iWorksheets :3Vocabulary :4

AK.RST.6-8. Reading Standards for Literacy in Science and Technical Subjects 6-12

Craft and Structure

RST.6-8.4. Determine the meaning of symbols, key terms, and other domain-specific words and phrases as they are used in a specific scientific or technical context relevant to grades 6-8 texts and topics.