The molten layers of Earth were created when Earth heated up because of

Explanation:

There are three main sources of heat in the deep earth: (1) heat from when the planet formed and accreted, which has not yet been lost; (2) frictional heating, caused by denser core material sinking to the center of the planet; and (3) heat from the decay of radioactive elements.

1. efficient use of space

2. elimination of groundwater contamination

3. energy generation

4. lower carbon footprint

the three components of a nucleotide are the nitrogenous base, the phosphate group and the five-carbon sugar.