Activity 3

2. When earth pieces diverge on land a deep valley forms a volcano a mountain that forms with molten material
7. when the plates move together
10. ocean floor can plunge into deep underwater canyons
11. The idea of continents drifting apart
12. After magma cools, it forms solid rocks
13. A major chain of volcano activity
14. when the plates move apart
15. When the ocean floor sinks beneath a deep ocean trench and back into the mantle
16. Volcanos sometimes create a string of islands
18. Supercontinent 300 million years ago
19. when mid-ocean ridges add new material to the ocean floor

1. The flow of heat that transfers within a fluid
3. made the theory of continental drift
4. Matthe serial deep within earth rises through and melts to form what
5. A theory that the earth's plates are in slow, and constant motion, driven by convection currents in the mantle
6. when the plates slip past each other
8. Mountian that forms magma
9. Molten material containing gasses and water from the mantle
17. When rocks slip past each other these break
20. are something that lived long ago preserved in a rock