2nd 9-Week Exam Review

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Across
  1. 2. a trace of an ancient organism that has been preserved in rock.
  2. 4. the management of soil to prevent its destruction.
  3. 8. a type of weathering in which rock is physically broken into smaller pieces.
  4. 12. process in which sediment is laid down in a new location.
  5. 14. a substance that provides energy as the result of chemical change.
  6. 16. when farmers disturb the soil and its plant cover as little as possible.
  7. 17. fossils of widely distributed organisms that lived during only one short period.
  8. 18. this occurs when iron combines with oxygen in the presence of water.
  9. 21. soil that is made up of about equal parts of clay, sand, and silt.
  10. 24. a fossil that is a copy of an organism's shape, formed when minerals seep into a mold.
  11. 27. a fossil in which minerals replace all or part of an organism.
  12. 28. the area of the Great Plains where wind erosion caused soil loss during the 1930's.
  13. 29. fuel made form living things.
  14. 30. horizon B is made of this and consists mostly of clay and other particles.
  15. 31. is the use of air flow through wind turbines to mechanically power generators for electric power.
  16. 32. a fossil formed when an organism buried in sediment dissolves, leaving a hollow area.
  17. 33. loose weathered material on Earth's surface in which plants can grow.
  18. 34. provides evidence about the history of life and past environments on Earth.
  19. 37. the process that breaks down rock through chemical changes.
  20. 38. a resource that cannot be replaced once used.
  21. 40. a scientist who studies fossils to learn about organisms that lived long ago.
Down
  1. 1. is the use of nuclear reactions that release nuclear energy to generate heat, which most frequently is then used in steam turbines to produce electricity in a nuclear power plant.
  2. 3. a layer of soil that differs in color and texture from the layers above or below it.
  3. 5. organisms that break the remains of dead organisms into smaller pieces and digest them with chemicals
  4. 6. the process that breaks down rock and other substances at Earth's surface.
  5. 7. the process that splits rock when water seeps into cracks, then freezes and expands.
  6. 9. when farmers plow their fields along the curves of a slope.
  7. 10. when a farmers plant different crops in a field each year.
  8. 11. electricity produced using the energy of flowing water.
  9. 13. heat from Earth's interior.
  10. 15. horizon A is made of this crumbly, dark brown soil that is a mixture of humus, clay, and other minerals.
  11. 19. a type of fossil that provides evidence of the activities of ancient organisms.
  12. 20. solid layer of rock beneath the soil.
  13. 22. the removal of rock particles by wind, water, ice or gravity.
  14. 23. an energy rich substance such as coal, oil, or natural gas.
  15. 25. the grinding away of rock by rock particles carried by water, ice, or gravity.
  16. 26. dark-colored organic substance that forms as plant and animal remains decay.
  17. 35. energy from the sun.
  18. 36. a resource that can be replaced when needed.
  19. 39. this part of the plant helps prevent erosion