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| single bed of sedimentary rock, consisting of one kind of matter representing continuous deposition |
| central portion of the earth believed to be composed mainly of iron and nickel in a molten state |
| evaporite (ĭ-vāp'ə-rīt') Pronunciation Key
A sedimentary rock that consists of one or more minerals formed as precipitates from the evaporation of a saline solution, such as saltwater. Usually, the first evaporite to form from saltwater is calcium, followed by gypsum and then halite. |