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Natural environment
Related to any physical feature of the earth's natural environment.
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Natural environment > Volcano 
rhyodacite
Natural environment; Volcano
An extrusive rock intermediate in composition between dacite and rhyolite.
rhyolite
Natural environment; Volcano
Volcanic rock (or lava) that characteristically is light in color, contains 69% silica or more, and is rich in potassium and sodium.
rift system
Natural environment; Volcano
The oceanic ridges formed where tectonic plates are separating and a new crust is being created; also, their on-land counterparts such as the East African Rift.
rift zone
Natural environment; Volcano
A zone of volcanic features associated with underlying dikes. The location of the rift is marked by cracks, faults, and vents.
ring of fire
Natural environment; Volcano
The regions of mountain-building earthquakes and volcanoes which surround the Pacific Ocean.
scoria
Natural environment; Volcano
A bomb-size (> 64 mm) pyroclast that is irregular in form and generally very vesicular. It is usually heavier, darker, and more crystalline than pumice.
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- Climate (1147)
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- Volcano (5852)
- Water (18527)