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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 
peak-ring craters
Earth science; Geology
A central uplift characterized by a ring of peaks rather than a single peak; peak rings are typical of larger terrestrial craters above about 50 kilometers (30 miles) in diameter.
perigee
Earth science; Geology
The point in the orbit of an Earth satellite where it is closest to the Earth.
perihelion
Earth science; Geology
The point in the path of a planet, asteroid, comet, or other body that is closest to the sun.
permafrost
Earth science; Geology
Permanently frozen soil or subsoil, occurring in arctic, sub-arctic, and alpine regions. Its thickness ranges from 30 cm to > 1000 meters, and it underlies about 1/5 of the ...
phanerozoic
Earth science; Geology
That part of geologic time represented by rocks in which the evidence of life is abundant, and includes the Cambrian and later time.
phlogopite
Earth science; Geology
A magnesium rich mineral of the mica group: K(Mg,Fe) 3 AlSi 3 O 10 (OH,F) 2 . It is yellowish brown to brownish red and usually occurs in crystalline limestones as a result of ...
phobos
Earth science; Geology
The irregularly shaped, dark colored moon of Mars. Phobos is larger than its companion moon Deimos. Both orbit very close to Mars, have short periods of revolution (0.3 days for ...
Sub-categories
- Geology (10953)
- Mapping science (105290)
- Oceanography (12332)
- Physical oceanography (42660)
- Remote sensing (8661)
- Seismology (14406)
- Soil science (29216)