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