Plate Tectonics

4. This happens at a mid-oceanic ridge where two plates are moving apart and new crust is forming.
10. The type of crust lying under the oceans of the world. It is only 4 to 6 miles (7 to 10 km)thick and usually younger than continental crust.
12. Plate boundary where the plates collide
13. One tectonic plate is pushed beneath another plate
15. melted rock beneath Earth’s surface.
16. a slowly flowing layer of solid and melted rock formed by heat and pressure; the lithosphere floats on the asthenosphere.
17. This layer of the earth lies between the mantle and the solid inner core. It is the only liquid layer, a sea of mostly iron and nickel about 1,400 miles (2,300 km) thick.
20. Made up of the crust and a tiny bit of the upper mantle, this zone is divided into several constantly (very slowly) moving plates of solid rock that hold the continents and oceans.

1. Plate boundary where the plates slide past each other
2. where the plates move apart
3. melted rock on Earth’s surface.
5. The dividing line where tectonic plates meet
6. This happens at a mid-oceanic ridge where two plates are moving apart and new crust is forming.
7. The innermost layer of the earth, an extremely hot, solid sphere of mostly iron and nickel. The inner core is 3,200 to 3,960 miles (5,150 to 6,378 km) below the surface and about 750 miles (1,200 km) thick.
8. This dense layer of the earth is made of hot, semisolid rock and is located directly below the crust. It is about 1,800 miles (2,900 km) thick.
9. The name given to the supercontinent that existed more than 225 million years ago, in which the present‐day continents were joined together in one large landmass.
11. the process of transferring heat through air or liquid currents.
14. Sections of the Earth’s surface that move-- these sections can include both continental and oceanic crust
18. the sudden release of strain energy in the Earth's crust, resulting in waves of shaking that radiate outwards from the earthquake source.
19. The border between two tectonic plates