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Definitions (107)
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lacustrine plain
A nearly level land area that was formed as a lakebed.
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archipelago
A collection of islands in a sea.
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glacial till
The mass of rocks and finely ground material carried by a glacier, then deposited when the ice melted. This creates an mixture made up of many different types of rocks and other materials.
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absolute location
The location of a point on the Earth's surface that can be expressed by a grid reference such as latitude and longitude.
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active volcano
A volcano that is currently erupting, or has erupted during recorded history.
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altitude
Height of an object in the atmosphere above sea level.
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ash
Fragments less than 2 millimeters (about 1/8 inch) in diameter of lava or rock blasted into the air by volcanic explosions.
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base level
The lowest level to which a stream can erode its bed. The ultimate base level of all streams is, of course, the sea.
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batholith
A very large body of igneous rock, usually granite, which has been exposed by erosion of the overlying rock.
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