Advanced Geosciences publishes new glossary of typical geological terms

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Courtesy of Advanced Geosciences, Inc.

Aa: A blocky and fragmented form of lava occurring in flows with fissured and angular surfaces.
A-horizon: The uppermost layer of a soil, containing organic material and leached minerals.
Algal mat: A layered communal growth of algae observed in fossils an in present day tidal zones associated with carbonate sedimentation.

Alkali metal: A strongly basic metal like potassium or sodium.

Alluvial fan: A low, cone shaped deposit of terrestrial sediment formed where a stream undergoes an abrupt reduction of slope.

Alluvium: Unconsolidated terrestrial sediment composed of sorted or unsorted sand, gravel, and clay that has been deposited by water.

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