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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 
cut-off grade
Earth science; Geology
The lowest grade of mineralized material considered to be economic and used to calculate the ore reserve in a deposit
acanthodians
Earth science; Geology
A primitive group of Silurian to Permian jawed bony fishes, bearing bony spines in front of all but their caudal fins.
cross sea
Earth science; Geology
Confused, irregular state of the sea due to different groups of waves from different directions raised by local winds.
principal aquifer
Earth science; Geology
The aquifer or combination of related aquifers in a given area that is the important economic source of water to wells.
barrier lake
Earth science; Geology
When a lake is formed by a natural barrier stopping water draining away. Natural barriers can be moraine, rock or lava.
attenuation
Earth science; Geology
The chemical, physical, and(or) biological processes that restrict the migration of contaminants through geologic media.
aurora borealis
Earth science; Geology
Also known as the northern lights; spectacular colored lights that appear in the sky in the far Northern Hemisphere.
Sub-categories
- Geology (10953)
- Mapping science (105290)
- Oceanography (12332)
- Physical oceanography (42660)
- Remote sensing (8661)
- Seismology (14406)
- Soil science (29216)