7th Grade Midterm Crossword #3

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Across
  1. 3. __________ igneous rock forms when lava cools above ground
  2. 6. dark, dense igneous rock that is rich in iron and magnesium but poor in silica
  3. 8. the plant fossil Wegener used to support continental drift
  4. 12. the reptile fossil Wegener used to support continental drift
  5. 13. diagram that shows how weathering, erosion, compaction, cementation, melting, and cooling can affect rocks
  6. 15. __________ igneous rock forms when magma cools below ground
  7. 17. __________ boundaries are where plates move together
  8. 19. the normal and reverse polarity bands ________ across the sea floor
  9. 22. and example of an oceanic-continental convergent boundary
  10. 23. _________ boundaries are where plates move away from each other
  11. 24. a ___________ ridge is an example of a divergent boundary under water
Down
  1. 1. an example of a continental-continental convergent boundary
  2. 2. _________ currents are the best explanation for why the plates move; they involve magma heating, rising, cooling, & sinking
  3. 4. continental _______ was Wegener's hypothesis that the continents moved very slowly over time
  4. 5. plastic-like layer of the mantle below the lithosphere
  5. 7. __________ zones are where one plates sinks beneath another; volcanoes are common here
  6. 9. rigid layer of the Earth; includes the crust and upper mantle
  7. 10. rock, ________, and climate clues were used to support continental drift
  8. 11. the size of mineral crystals when magma cools very slowly
  9. 14. light, low density igneous rock that is rich in silica but poor in iron and magnesium
  10. 16. the conservation of matter states that matter cannot be created or __________
  11. 18. what Wegener called the single landmass from 200 million years ago
  12. 20. _________ boundaries are where plates slide along each other horizontally
  13. 21. the Great _____ Valley is an example of a divergent boundary on land
  14. 22. the San __________ fault is an example of a transform boundary