GENERAL GEOLOGY

Detailed explanation-1: -Our planet’s thin, 40-kilometer (25-mile) deep crust-just 1% of Earth’s mass-contains all known life in the universe. Earth has three layers: the crust, the mantle, and the core. The crust is made of solid rocks and minerals.

Detailed explanation-2: -Abstract. Global observations show that the crustal thickness varies through the tectonic regions. While the continental crust is 30–70 km thick, the oceanic crustal thickness is 6–12 km. The oceanic crust is also denser (2.8–3.0 g/cm3) than the continental crust (2.6–2.7 g/cm3).

Detailed explanation-3: -Continental crust makes up the land on Earth, it is thicker (35-70 km), less dense and mostly made up of the rock granite. Oceanic crust makes up most of the ocean, it is thinner (5-7 km), denser and mostly made up of the rock basalt.

Detailed explanation-4: -(In some places, Earth’s crust may be up to 70 km [40 miles] thick.) The mantle is much thicker than the crust; it contains 83 percent of Earth’s volume and continues to a depth of 2, 900 km (1, 800 miles).

Detailed explanation-5: -Crust: Two types of crust make up Earth’s outermost layer: continental and oceanic. Continental crust is composed of silica-rich rocks and is an average of 44 miles (70 km) thick. Ocean crust is made of dark, silica-poor rocks like basalt.