7th-Grade Earth Science Review

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Across
  1. 3. compositional layer of hot, solid material between Earth's crust and core.
  2. 6. a type of rock that forms from an existing rock that is changed by heat, pressure, or chemical reactions.
  3. 11. the transfer of heat by circular currents in a fluid; in earth science, the process in the mantle that moves the continental plates above
  4. 13. Greek word for "all lands"
  5. 14. Process by which new crust is created at mid-ocean ridges
  6. 15. the chemical and physical processes that break down rock at Earth's surface.
  7. 19. a physical layer consisting of a dense sphere of solid iron and nickel at the center of Earth, composed mainly of iron and nickel
  8. 20. a type of rock that forms from the cooling of molten rock at or below the surface
  9. 21. the layer of rock that forms Earth's outer surface (compositional layer)
  10. 22. the process by which fertile land becomes desert, typically as a result of drought, deforestation, or inappropriate agriculture.
  11. 24. the situation that arises when more soil nutrients are used than the decomposers can supply
  12. 25. Molten rock beneath the earth's surface
Down
  1. 1. small, solid pieces of material that come from rocks or living things
  2. 2. A plate boundary where two plates move away from each other; forms rift valleys and mid-ocean ridges.
  3. 4. A rigid layer made up of the uppermost part of the mantle and the crust.
  4. 5. Movement of people from rural areas to cities, disrupting the ecosystem and displacing native plants and wildlife
  5. 7. The theory that the Earth's crust is composed of plates that are in constant motion
  6. 8. the action of clearing a wide area of trees faster than they can be replaced; leads to erosion, flooding, and habitat loss
  7. 9. A major belt of volcanic and seismic activity that rims the Pacific Ocean
  8. 10. processes by which particles of rock, sand, and soil are carried away by wind or flowing water
  9. 12. A plate boundary where two plates move toward each other; forms deep-ocean trenches, volcanic mountains, and folded mountains.
  10. 16. The process by which oceanic crust sinks under another plate andeventually back into the mantle at a convergent plate boundary.
  11. 17. A plate boundary where two plates move past each other in opposite directions; forms faults and earthquakes.
  12. 18. A type of rock that forms when particles from other rocks or the remains of plants and animals are pressed and cemented together
  13. 23. liquid physical layer that lies beneath the mesosphere, composed mainly of iron and nickel