SOLAR SYSTEM

Detailed explanation-1: -The depth of the boundary between the crust and the mantle varies from about 5 to 8 km under ocean basins and about 20 to 70 km under continents. How do scientists study the location of this boundary? They study the composition of meteorites. They study the behavior of seismic waves.

Detailed explanation-2: -Earth’s crust is 5 to 70 km thick. 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-3: -The upper mantle begins at a depth of from 5 to 50 kilometers (3−30 miles) and extends to a depth of approximately 670 kilometers (400 miles) from the surface; the lower mantle extends from a depth of about 670 kilometers (400 miles) to about 2, 900 kilometers (1, 740 miles). The lithosphere.

Detailed explanation-4: -In 1909, Andrija Mohorovičić, a Croatian seismologist, discovered the boundary between the crust and the mantle by observing the sudden increase of seismic waves as they passed from the crust to the mantle.

Detailed explanation-5: -The boundary between the crust (continental or oceanic) and the underlying mantle is known as the Mohorovičić discontinuity (also called Moho), which is named for its discoverer, Croatian seismologist Andrija Mohorovičić.