20 Terms
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Geology
The science that comprises the study of the solid Earth and the processes by which it is shaped and changed.
Industry: Earth science
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Geology
Joint
Earth science; Geology
A surface of fracture in a rock, without displacement parallel to the fracture.
Argillic horizon
Earth science; Geology
A clay-rich layer of soil. Clay often forms in overlying soil layers from the decomposition of feldspars and other minerals. The extremely fine clay particles are gradually carried down by water to ...
Annual snowline
Earth science; Geology
A term used by glaciologists (scientists who study glaciers) for the boundary where the amount of snow loss from melting equals the amount of snow accumulation from snowfall (also called firn limit).
Aplite
Earth science; Geology
A light-colored igneous rock with the same mineral composition as granite: quartz, plagioclase feldspar, and potassium feldspar, but with a fine-grained, almost sugary texture.
Argillite
Earth science; Geology
Name used for unusually hard, fine-grained sedimentary rocks, such as shale, mudstone, siltstone, and claystone. Commonly black.
