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: -Crust. The solid crust is the outermost and thinnest layer of our planet. The crust averages 25 miles (40 kilometers) in thickness and is divided in to fifteen major tectonic plates that are rigid in the center and have geologic activity at the boundaries, such as earthquakes and volcanism.

Detailed explanation-3: -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). The average Archean crust is  35 km thick, whereas the Proterozoic crust is significantly thicker ( 45 km).

Detailed explanation-4: -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-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.