Plate Tectonics

6. When tectonic plates move apart from each other.
7. A type of crust that carries water.
10. solid rock varying in thickness between 0-60km thick.
11. The semi-molten rocks rich in magnesium and silicon up to 2900km thick.
12. a current in a fluid that results from convention or the heat transfer due to the bulk movement of molecules within a liquid.
13. Solid nickel and iron. Very high pressure and a temperature of 4000- 6000 degrees celsius.
15. When tectonic plates move together and one plate goes underneath the other.
16. The areas where two or more plates meet each other.
18. Makes up the topmost 100km of the Earth, and includes the upper part of the mantle, and whole of the crust.

1. The upper part of the mantle that is semi-molten.
2. Tectonic plates that slide past each other.
3. Convection currents in the plastic mantle drag the overlying lithosphere.
4. of magma into the spreading of ocean ridges as the Mid-Atlantic Ridge propels plates apart.
5. A type of crust that carries land.
8. When tectonic plates move together and push upwards.
9. Liquid nickel and iron. With high pressure and temperature.
14. sections of the earth’s crust.
17. Cold, denser oceanic lithosphere sinks due to gravity into the subduction zones (where one plate has been moved under another) at places such as the Aleutian trench; this drags the rest of the plate with it.