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The theory that horizontal movement of the earth's surface causes slow, relative movements of the continents toward or away from one another.
Line drawn on a map connecting points which have the same height or depth.
A small, horseshoe-shaped body of water along the coast; the water is surrounded by land formed by soft rock.
A steep-sided, usually circular depression formed by either explosion or collapse at a volcanic vent.
A mixture of water-saturated rock debris that flows downslope under the force of gravity (also called lahar or mudflow).
A delta is a low, water, land formed at the mouth of a river. It is formed from the silt, sand and small rocks that flow downstream in the river and are deposited in a __________. It is often shaped like a triangle.
A large region with little or no vegetation as a result of not receiving enough precipitation.
Literally, "sleeping." The term is used to describe a volcano which is presently in active but which may erupt again. Most of the major Cascade volcanoes are believed to be dormant rather than extinct.
The area of land drained by a river system.
A hill or ridge made of sand. These are shaped by the wind and change all the time.