Unit 5 Terminology Review

5. A process where newly formed crust at the mid-ocean ridge pushes older crust away
7. Magma that reaches Earth's surface
8. A circle of volcanoes surrounding the Pacific Ocean.
10. The movement of substances due to differences in density. Less dense move up while more dense move down
12. Molten rock beneath the earth's surface
13. Preserved remains of once-living organisms
16. The region where oceanic plates sink down into the asthenosphere.
17. Sections of the Earth's crust that move due to convection currents.
18. An underwater mountain chain where new ocean floor is formed

1. A supercontinent containing all of Earth's land that existed about 225 million years ago.
2. A plate boundary where two plates move away from each other.
3. The point where two tectonic plates meet
4. The hypothesis that the continents slowly move across Earth's surface.
6. The process that creates new sea floor as plates move away from each other at the mid-ocean ridges
9. The boundary between tectonic plates that are sliding past each other horizontally
11. A theory stating that the earth's lithosphere is broken into plates that move.
14. The idea that the more dense edge of a plate is pulled under a less dense edge of another plate
15. A plate boundary where two plates move toward each other.