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Natural environment
Related to any physical feature of the earth's natural environment.
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Natural environment > Volcano 
miocene
Natural environment; Volcano
An epoch in Earth's history from about 24 to 5 million years ago. Also refers to the rocks that formed in that epoch.
moho
Natural environment; Volcano
Also called the Mohorovicic discontinuity. The surface or discontinuity that separates the crust from the mantle. The Moho is at a depth of 5-10 km beneath the ocean floor and ...
mudflow
Natural environment; Volcano
A flowage of water-saturated earth material possessing a high degree of fluidity during movement. A less-saturated flowing mass is often called a debris flow. A mudflow ...
myth
Natural environment; Volcano
A fictional story to explain the origin of some person, place, or thing.
nuees ardentes
Natural environment; Volcano
A French term applied to a highly heated mass of gas-charged ash which is expelled with explosive force and moves hurricane speed down the mountainside.
obsidian
Natural environment; Volcano
A black or dark-colored volcanic glass, usually composed of rhyolite.
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- Air (43)
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- Climate (1147)
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- Volcano (5852)
- Water (18527)