plate tectonic

2. a sudden and violent shaking of the ground, sometimes causing great destruction, as a result of movements within the earth's crust or volcanic action.
4. the gradual movement of the continents across the earth's surface through geological time.
5. f two tectonic plates collide, they form a convergent plate boundary. Usually, one of the converging plates will move beneath the other, a process known as subduction.
6. When two plates come together,
8. A divergent boundary occurs when two tectonic plates move away from each other.
9. a large elongated depression with steep walls formed by the downward displacement of a block of the earth's surface between nearly parallel faults or fault systems.
10. a mountain or hill, typically conical, having a crater or vent through which lava, rock fragments, hot vapor, and gas are being or have been erupted from the earth's crust.

1. a large natural elevation of the earth's surface rising abruptly from the surrounding level; a large steep hill.
3. long, seismically active submarine ridge system situated in the middle of an ocean basin and marking the site of the upwelling of magma associated with seafloor spreading. An example is the Mid-Atlantic Ridge.
7. boundary where plates slide sideways past each other