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Waterfalls or rivers form and drop lower to land.
Fall line
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It has a flat topand steep sides.
Mesa
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A gap between two mountains.
Mountain pass
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a piece of land connected to two pieces of land.
Istmus
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the place where a river begins
source of river
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a lowland with moist soil and tall grasses
Marsh
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an area of flat land along a sea or ocean
Coastal plain
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an area of low, wet land with trees
Swamp
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a triangle-shaped area of land at the mouth of a river
Delta
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level of the surface of an ocean or a sea
sea level
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a bowl shaped area of land surrounded by higher land
basin
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an inlet of the sea or of some other body of water, usually smaller than a gulf
Bay
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a deep narrow valley with steep sides
Canyon
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The deepest part of a body of water
Channel
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a large ice mass that moves slowly down a mountain or across land
glacier
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part of a sea or ocean extending into the land, usually larger than a bay
Gulf
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any area of water extending into the land from a larger body of water
inlet
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land that is almost completely surrounded by water.
peninsula
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a chain of mountains
mountain range
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place where a river empties into another body of water
mouth of river
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an area of flat or gently rolling low land
plain
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an area of high, mostly flat land
plateau
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an area of grass land and scattered with trees
savanna
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a narrow channel of water connecting two larger bodies of water
strait
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a stream or river that flows into a larger stream or river
tributary
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an opening in the earth, often raised, through which rock, ashes, and gases are forced out.
Volcano
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