John Oneil land

4. a super continent made up of the worlds landmass joined together
5. openings, or vents where lava, tephra (small rocks), and steam erupt onto the Earth's surface
8. a scientific theory that explains how major landforms are created as a result of Earth's subterranean movements
10. sany of the world's main continuous expanses of land
11. A natural feature of the earths surface
12. German meteorologist and geophysicist
13. the breaking down or dissolving of rocks and minerals on the surface of Earth
15. the movement of continents resulting from the motion of tectonic plates
16. the location where to plates meet
19. the sudden release of strain energy in the Earth's crust, resulting in waves of shaking that radiate outwards from the earthquake source
20. A super continent of the northern hemisphere made up of landmasses
21. hot or cold mixture of water and rock fragments that flow quickly down the slopes of a volcano

1. A large area of land that is believed to have existed long ago
2. Heat driven cycles that occurs in the ocean mantle
3. warn away by water,wind,glaciers
6. A hot mixture of rock fragments that travels rapidly
7. a long, seismically active submarine ridge system situated in the middle of an ocean
9. the inner most layer of the earth
14. the liquid layer of the Earth's core, located between the inner core and the mantle
17. hot molten,molten,rock erupted
18. The liquid or molten rock found beneath earths suurface.