Plate Tectonics

2. / Fracture in a volume of rock, across which there has been significant displacement as a result of rock mass movement
4. Atlantic Ridge / mid-ocean ridge, a divergent tectonic plate or constructive plate boundary located along the floor of the atlantic ocean and part of the longest mountain range in the world
5. Valley / a long elongated depression with steep walls formed by the downward displacement of a block of the earth's surface between nearly faults or fault systems
8. Boundary / two or more tectonic plates move towards each other
9. Currents / current in a fluid that results from convection
10. / sideways and downward movement of the edge of a plate of the earth's crust into the mantle beneath another plate
12. / a sudden and violent shaking of the ground sometimes causing great destruction
14. / a mountain or hill, having a crater or vent through which lava and gas are being erupted from the earth's crust
15. Andreas Fault / continental transform fault that extends roughly 1300 km through California. It forms the tectonic boundary between the pacific-plate and the north american plate, and its motion is right-lateral strike slip
16. of Plate Tectonics / Theory that the outer rigid layer of the earth (lithosphere) is divided into a couple of dozen "plates" that move around across the earth's surface relative to each other
18. / layer of hot rock material that is located beneath the crust

1. / layer of earth that forms the outer skin
3. / a long, narrow ditch
4. Ranges / a line of mountains connected by high ground
6. crust / hick part of the earth's crust that forms the large land masses
7. Crust / thin part of the earth's crust that underlines the ocean basins
11. Boundary / two or more tectonic plates move away from each other
13. Boundary / places where plates slide sideways past each other
17. of Fire / an area in the basin of the pacific ocean whee a large number of earthquakes and volcanic eruptions occur