Scientists believe that differences in cause hot, plastic-like rock in the asthenosphere to rise toward earth's surface. a. density c. weight b. magnetism d. composition

Density (a) is the correct answer

 
Scientists believe that differences in density cause hot, plastic-like rock in the asthenosphere to rise toward earth's surface.

density

Explanation:

Due to the density of the rocks that vary the scientist believe is the reason for the hot and plastic-like rocks to form in the earth's asthenosphere and rise above the surface. As the rocks with a higher density and a higher weight exert great pressure and force that lead to the rise of magma and escape of gases from the surface and the thus the magma is released to the surface of the earth.

I'm pretty sure it's c. extremely gradual but not 100% sure though.