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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 > Soil science 
independent tetrahedra
Earth science; Soil science
Silicate type minerals in which no oxygens are shared between silica tetrahedra; silicon-oxygen ration is SiO44-; example mineral: olivine, (Mg, Fe)2SiO4.
gley soil
Earth science; Soil science
Soil developed under conditions of poor drainage resulting in reduction of iron and other elements and in gray colors and mottles.
oven-dry soil
Earth science; Soil science
Soil that has been dried at 105°C until it reaches constant mass.
dinitrogen fixation
Earth science; Soil science
Conversion of molecular nitrogen (N2) to ammonia and subsequently to organic nitrogen utilizable in biological processes.
functional nutrient
Earth science; Soil science
Chemical elements that function in plant metabolism whether or not their action is specific.
Sub-categories
- Geology (10953)
- Mapping science (105290)
- Oceanography (12332)
- Physical oceanography (42660)
- Remote sensing (8661)
- Seismology (14406)
- Soil science (29216)