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EARTH and SPACE SCIENCE - Public |
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EDQUEST SCIENCE student and teacher resources here have been aligned to the content standards for SCIENCE EDUCATION in the United States.
Explore the Units and feel free to use what you need to help you understand what you are learning in Science.
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EARTH and SPACE SCIENCE (5-8) and (9-12)
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ENERGY IN THE EARTH SYSTEM - Earth systems have internal and external sources of energy, both of which create heat. The sun is the major external source of energy. Convection currents in the mantle propel the tectonic plates of the earth's surface. Heating of earth's surface and atmosphere by the sun drives convection currents in the atmosphere and oceans, producing winds and ocean currents. Climate is determined by energy transfer influenced by cloud cover, the earth's rotation, and the position of mountain ranges and oceans.
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GEOCHEMICAL CYCLES -.Elements on the Earth can exist in several different places, moving through the earth, oceans, atmosphere, and organisms as part of geochemical cycles. Movement of matter is driven by the earth's internal and external sources of energy. Carbon, water and Nitrogen are all part of the chemistry of life on Planet Earth.
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THE ORIGIN AND EVOLUTION OF THE EARTH SYSTEM - The sun, the earth, and the rest of the solar system formed from a nebular cloud of dust and gas. Geologic time is estimated by observing rock sequences and using fossils. Decay rates of radioactive isotopes present in rocks measure the time since the rock was formed. Sudden change includes earthquakes and volcanic eruptions. Gradual changes include mountain building and plate movement.
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THE ORIGIN AND EVOLUTION OF THE UNIVERSE - The "big bang" theory suggests the universe began in a hot dense state and it has been expanding ever since. Matter, primarily hydrogen and helium, came together by gravitation to form trillions of stars. Billions of galaxies, with billions of stars, now form most of the visible mass in the universe. Stars produce energy from nuclear reactions, - fusion of hydrogen to form helium. |
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