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

Can you give an explanation of what medc and ledc are.

The hypothetical island country of gilder lies in the mediterranean sea off the coast of france. demographers have studied gilder for the past 50 years. at the beginning of the study, gilder had a population of 20 million. the demographers have measured birth and death numbers, as well as immigration and emigration numbers, as shown in the data table. from the data, calculate the population of gilder for each 10-year period by filling in the population (no) and population (nt) columns in the data table. use this formula to do your calculations: population size: nt = no + (b + i) – (d + e)initial population = 20,000,000

Which describes the solid flying debris from a volcano