Which rock group makes up the least part of earth's crust?

ANSWER:

Sedimentary rocks make up the least part of the earth's crust.

EXPLANATION:

The sedimentary rocks form a 'thin layer of the earth's crust' and form just about 5% of the crust. The metamorphic and igneous rocks cover about '95% of the earth's crust'. The sedimentary rocks are found near the 'surface of the earth' because these are formed by the processes that occur on the surface. The 'igneous and metamorphic rocks' are found in the 'earth's crust' because these are formed by processes that take place deep inside the earth.

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