Plate Tectonics Vocabulary Worksheet

2. The downward movement of a plate into the mantle.
5. Waves that travel through both fluid and solid material.
7. The third outmost layer of the Earth.
10. Plates move apart.
12. The transfer of heat caused by the movement of fluids.
13. All continents were once joined in a single landmass and have since slowly drifted apart.
15. The second outmost layer of the Earth.
16. Waves that travel through only solid material.
18. Weak spots around the crust where magma flows to the surface.
19. Plates side-slip past each other.
20. Waves that spread through Earth's interior.

1. A process that continually adds new material to the ocean floor.
3. The innermost layer of the Earth.
4. The outmost layer of the Earth.
6. Plates collide or smash together.
8. Pieces of the Earth's crust and upper mantle constantly move.
9. The longest chain of under-water mountains.
11. A single landmass that existed 300 million years ago comprised of all of Earth's continents.
14. The transfer of energy through space with no direct contact between a heat source and an object.
17. The transfer of heat between materials that are touching.