Plate Tectonics

3. The crust and uppermost mantle; Earth's outer layer, broken into several large, rigid pieces called tectonic plates.
7. A light colored, low-density rock that makes up the continents.
9. type of boundary when two tectonic plates move away from each other.
10. type of boundary when two plates come together.
13. A scientist who studies the structure of earth to understand how it changes over time.
14. Comes from a Greek word meaning "to build."
16. The thick layer of hot rock beneath earth's crust.
17. type of plate that forms the ocean floor, thinner and denser
18. type of plate that carries mostly landmasses, thicker but less dense.
19. Molten rock.
20. The slow movement of Earth's continents across the planet's surface over millions of years.

1. A crack or break in earth's crust where two pieces of rock slide past each other, which can cause earthquakes.
2. The rising of hot rock from the mantle to Earth's surface.
4. A dark, dense rock that underlies the ocean floor.
5. Huge moving slabs that together make up Earth's outer layer.
6. A hot, soft layer of the mantle beneath the plates.
8. type of boundary where two plates slide past each other.
11. happens when crust is pushed down to the mantle and melts into magma
12. The naturally preserved remains, imprints, or traces of organisms that lived long ago.
15. A supercontinent that existed millions of years ago when all of earth's continents were joined together as one giant landmass.