Which layer constitutes about 80 percent of the volume of the earth?a.Biosphereb.Crustc.Cored.Mantle

d. Mantle

Explanation:

a. Biosphere - The biosphere is not a physical layer of the Earth. Instead, it refers to the parts of the Earth where life exists, including the land, sea, and air.

b. Crust - The crust is the thinnest and outermost layer of the Earth. It constitutes a very small volume of the Earth.

c. Core - The core is the innermost layer of the Earth, but it does not constitute 80 percent of the Earth's volume.

d. Mantle - The mantle is the layer of the Earth located between the crust and the core. It is the thickest layer and constitutes about 80 percent of the Earth's volume.