Slate and laterite are examples of _______________.
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A.
argillaceous rock
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B.
siliceous rock
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C.
calcareous rock
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D.
argillaceous and calcareous rocks, respectively
Correct Answer:
D. argillaceous and calcareous rocks, respectively
Explanation:
The correct answer is argillaceous rock.
Slate and laterite are classified as argillaceous rocks because their primary chemical constituent is clay or alumina. Slate is a fine-grained metamorphic rock formed from shale or mudstone, while laterite is a soil and rock type rich in iron and aluminium, commonly formed in tropical areas. Since both are predominantly composed of clayey materials, they fall under the argillaceous category in the chemical classification of rocks. In contrast, siliceous rocks are mainly composed of silica, and calcareous rocks are primarily composed of calcium carbonate.
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