Pangea

7. Earth's natural borders; the ones on Africa and South America fit like puzzles.
9. The circular heat currents in the mantle that drive plate movement.
11. Molten rock underground that wells up to create new crust at boundaries.
12. The final period of the Paleozoic era when Pangea was fully formed.
14. The massive prehistoric supercontinent that held all Earth's land.
16. The slow movement of Earth's landmasses across the surface.
17. The vast, single global ocean that completely surrounded Pangea.
18. A deep valley or tear created where tectonic plates pull apart.
19. A massive landmass made up of multiple smaller continents.
20. The ancient C-shaped sea nestled into the eastern side of Pangea.

1. The thick, molten layer under Earth's crust where convection happens.
2. The geological period when Pangea first started to break apart.
3. The German scientist who first proposed continental drift theory.
4. The geological study of how the plates of Earth's crust move.
5. The thin, solid outermost layer of Earth broken into moving pieces.
6. The southern half of the split supercontinent, including South America and Africa.
8. The physical edge or meeting line between two shifting tectonic plates.
10. The northern landmass formed after Pangea first split.
13. Massive moving ice sheet; its ancient scars on different continents match up.
15. Preserved plant or animal remains used to prove the continents were joined.