Across
- 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.
Down
- 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.