basic rock

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Any of a number of igneous rocks that are rich in the heavy compounds of iron, magnesium, and calcium. They tend to be darker than acidic rocks and many of them are weathered by chemical weathering which breaks down the crystal structure into the main mineral constituents. Basic rocks produce more fertile and productive soils than acidic rocks because nutrients are more freely available for plants. See also acid, intermediate, ultrabasic.

Subjects: Environmental Science.

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