GEOLOGY

Detailed explanation-1: -Sedimentary rocks makes up to 66% of the earth’s crust, with 34 % being the igneous and the metamorphics. Igneous rocks however, forms the majority of 34 % (Ehlers and Blatt, 1997).

Detailed explanation-2: -Of the rocks exposed on the Earth’s surface, 66 percent (±3.5 percent) are sedimentary and 34 percent are crystalline, at the 95 percent confidence level.

Detailed explanation-3: -Sediments are loose, unconsolidated rock particles and ions (i.e., charged atoms) dissolved in aqueous solutions. Sedimentary rocks, which constitute about 75% of all rocks exposed at the surface of the Earth, form when the particles are cemented together or when crystals precipitate from the solutions.

Detailed explanation-4: -Sedimentary rocks make up 75 percent of the rocks at the earth’s surface but only 5 percent of the outer 10 miles of the earth. Sediment, as distinguished from sedimentary rock, is a collective name for loose, solid particles and is generally derived from weathering and erosion of preexisting rock.

Detailed explanation-5: -Only about 5% of the Earth’s crust is composed of sedimentary rocks, but they cover 70-75% of the exposed surface and contain many economically important minerals, as well as coal and petroleum.