ge-at.iastate.edu

Website:https://ge-at.iastate.edu
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Definitions (791)

1

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exotic river


A river that is able to maintain its flow through a desert because of water received from outside the desert.
Source: ge-at.iastate.edu

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stratified drift


Debris washed from a glacier and laid down in well-defined layers.
Source: ge-at.iastate.edu

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2   3

bedding plane


Surface separating layers of sedimentary rocks and deposits. Each bedding plane marks termination of one deposit and beginning of another of different character, such as a surface separating a sandstone bed from an overlying mudstone bed. Rock tends to breaks or separate, readily along bedding planes.
Source: ge-at.iastate.edu

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seismic gap


A segment of an active fault zone that has not experienced a major earthquake during a time period when most other segments of the zone have. Generally regarded as having a higher potential for future earthquakes.
Source: ge-at.iastate.edu

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tidal delta


A delta formed at both sides of a tidal inlet.
Source: ge-at.iastate.edu

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arkose


A sedimentary rock formed by the cementation of sand-sized grains of feldspar and quartz.
Source: ge-at.iastate.edu

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bauxite


A rock composed of aluminum hydroxides and impurities in the form of silica, clay, silt, and iron hydroxides. A residual weathering product, exploited as the primary ore for aluminum.
Source: ge-at.iastate.edu

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cone of depression


A downward distortion or dimple in the water table that forms as a well pumps water faster than it can flow through the aquifer.
Source: ge-at.iastate.edu

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differentiation


The process of developing more than one rock type, in situ, from a common magma.
Source: ge-at.iastate.edu

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frost wedging


A type of disintegration in which jointed rock is forced apart by the expansion of water as it freezes in fractures.
Source: ge-at.iastate.edu


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