Plate Techtonics

4. Atlantic Ridge- is a 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. 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.
6. boundary- are places where plates slide sideways past each other.
7. boundary- is an actively deforming region where two or more tectonic plates or fragments of the lithosphere move toward one another and collide.
8. Currents- a current in a fluid that results from convection.
12. 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.
13. of Plate Tectonics- a theory of global tectonics in which the lithosphere is divided into a number of crustal plates, each of which moves on the plastic asthenosphere more or less independently to collide with, slide under,or move past adjacent plates.
14. a long, narrow ditch.
16. ranges- a line of mountains connected by high ground.

1. boundary- is a linear feature that exists between two tectonic plates that are moving away from each other.
2. of fire- an area in the basin of the Pacific Ocean where a large number of earthquakes and volcanic eruptions occur.
3. Valley- 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.
7. crust- the relatively thick part of the earth's crust that forms the large landmasses. It is generally older and more complex than the oceanic crust.
9. the sideways and downward movement of the edge of a plate of the earth's crust into the mantle beneath another plate.
10. an extended break in a body of rock, marked by the relative displacement and discontinuity of strata on either side of a particular surface.
11. ridges- an elevated region with a central valley on an ocean floor at the boundary between two diverging tectonic plates where new crust forms from upwelling magma.
15. Andreas Fault- a continental transform fault that extends roughly 1300 km through California. It forms the tectonic boundary between the Pacific Plate and the North American Plate.