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| outer layer of the earth, about 22 miles deep under the continents and 6 miles deep under the oceans |
| ratio of the volume of the pores of a substance to the total volume of the mass |
| orogeny (ô-rŏj'ə-nē) also orogenesis (ô-rŏj'ə-nē) Pronunciation Key
The process of mountain formation, especially by folding and faulting of the Earth's crust and by plastic folding, metamorphism, and the intrusion of magmas in the lower parts of the lithosphere. Unlike epeirogeny, orogeny usually affects smaller regions and is associated with evidence of folding and faulting. The long chains of mountains often seen on the edges of continents form through orogeny. |