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Makovka662 [10]
3 years ago
8

A graywacke is __________.

Biology
1 answer:
Irina-Kira [14]3 years ago
6 0

Answer:

The correct answer will be option-B

Explanation:

Graywacke is an impure sandstone which is characterized by its dark color, hardness, poorly sand-sized quartz grains mostly embedded in the muddy matrix made of clay.

Graywacke is widely spread in the Earth's crust and constitutes about 20-25% of the total sandstones on the Earth.

The graywacke is widely used by humans for the construction purpose of road and sea walls.

Thus, Option-B is the correct answer.

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