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Earth science
Any of several geological sciences that are concerned with the earth, its origins, and all of its various structures and physical forms and phenomena.
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Earth science > Geology 
actinolite
Earth science; Geology
A bright to gray-green member of the amphibole mineral family. In addition to silica, it contains calcium, magnesium, and iron. Actinolite is a non-hazardous relative of asbestos ...
active volcano
Earth science; Geology
A volcano that has erupted within historical time and is likely to do so again in the future.
aerosol
Earth science; Geology
Fine liquid or solid particles suspended in the atmosphere. Aerosols resulting from volcanic eruptions are tiny droplets of sulfuric acid -- sulfur dioxide that has picked up ...
horizon
Earth science; Geology
The top layer of soil. Plant and other organic debris builds up in this layer. This is the part of the soil generally referred to as 'top soil'.
airfall
Earth science; Geology
Volcanic ash that has fallen through the air from an eruption cloud. A deposit so formed is usually well sorted and layered. Also called ashfall.
alluvial fan
Earth science; Geology
As water slows down, it deposits sediment (alluvium) that gradually builds a fan.
alluvium
Earth science; Geology
Sand, gravel, and silt deposited by rivers and streams in a valley bottom.
Sub-categories
- Geology (10953)
- Mapping science (105290)
- Oceanography (12332)
- Physical oceanography (42660)
- Remote sensing (8661)
- Seismology (14406)
- Soil science (29216)