science chapter 3
Across
- 4. the supercontinent that existed over 300 million years ago
- 6. Earth's plates are in slow, constant motion, driven by convection currents in the mantle
- 8. where pieces of Earth's crust diverge on land form a deep valley
- 9. the process by which the ocean floor sinks beneath a deep ocean trench and back into the mantle
- 10. where plates come together or converge
- 11. the process of new material being add to the sea floor, pushing the old rock out
- 14. where rocks slip/slide past each other
Down
- 1. where molten material from earth's mantle pushes through the ocean floor
- 2. where old rock on the ocean floor sinks back into the mantle
- 3. breaks in earth's crust where rocks have slipped past each other form these boundaries
- 5. the idea that the continents slowly moved over earth's surface
- 7. where plates move apart or diverge
- 12. the huge pieces of rock that make up earth's surface
- 13. any trace of an ancient organism that has been preserved in rock