Pangea

3. A boundary where plates slide past each other.
8. The rigid outer layer of Earth, including the crust.
13. The movement of heat within the mantle that pushes the plates.
16. The plastic-like layer of the mantle that the plates slide on.
17. The location where new crust is formed at mid-ocean ridges.
19. A boundary where two plates pull apart.
20. The theory describing the motion of large sections of Earth's lithosphere.

1. An ancient fern fossil used as evidence for Continental Drift.
2. When one plate sinks beneath another into the mantle.
4. Evidence of these ice masses in tropical areas proved continents have shifted.
5. The way the coastlines of South America and Africa seem to fit together.
6. The slow movement of continents over millions of years.
7. The ancient supercontinent where all landmasses were joined.
9. The process occurring at divergent boundaries under the ocean.
10. The border where two tectonic plates meet.
11. Preserved remains of ancient organisms found on matching coastlines.
12. A boundary where two plates collide.
14. Molten rock beneath Earth's surface that creates new crust.
15. A freshwater reptile fossil found in both South America and Africa.
18. The scientist who proposed the theory of Continental Drift.