GEOLOGY

Detailed explanation-1: -Earth’s crust is generally divided into older, thicker continental crust and younger, denser oceanic crust . The dynamic geology of Earth’s crust is informed by plate tectonics.

Detailed explanation-2: -Continental crust is thicker, and predominantly felsic in composition, meaning that it contains minerals that are richer in silica. The composition is important because it makes continental crust less dense than ocean crust. Ocean crust is thinner, and predominantly mafic in composition.

Detailed explanation-3: -Continental crust is broadly granitic in composition and, with a density of about 2.7 grams per cubic cm, is somewhat lighter than oceanic crust, which is basaltic (i.e., richer in iron and magnesium than granite) in composition and has a density of about 2.9 to 3 grams per cubic cm.

Detailed explanation-4: -The oceanic crust is mainly made out of dark basalt rocks that are rich in minerals and substances like silicon and magnesium. By contrast, the continental crust is made up of light-colored granite rocks full of substances like oxygen and silicon.

Detailed explanation-5: -The continental crust is made up of a variety of rocks from sedimentary rocks such as sandstone and limestone to metamorphic rocks such as marble and slate, and igneous rocks like granite.