Question

which best explains how the collisions of materials in space contribute to the formation of layers in protoplanets? the materials undergo decay when they collide, which results in the heating and subsequent melting and rising of materials. the collisions release heat, which results in the heating and subsequent melting, sinking, and rising of materials. the materials undergo decay when they collide, which results in the cooling and subsequent hardening and rising of materials. the collisions absorb heat, which results in the cooling and subsequent hardening and rising of materials.

Explanation:

When materials collide in space during the formation of protoplanets, the collisions release heat. This heat causes the materials to heat up, melt, and then due to density - differences, heavier materials sink and lighter ones rise, forming layers.

Answer:

The collisions release heat, which results in the heating and subsequent melting, sinking, and rising of materials.