Question

what is it deffentiation and accretion ​

Answer 1

Answer:

The process of growth or increase, typically by the gradual accumulation of additional layers or matter.

Explanation:

The Earth formed by the process known as Accretion.  This process is "gravity-driven", and involves gravitational attraction of material in the vicinity of the solar disk to the growing Earth.  The process continues to this date with meteorite impacts, but must have occurred at a very high rate while the planet was initially forming.  Release of energy during impact of the accreting bodies produced heat.  Owing to the fact that the rocky material which comprises the Earth is a good heat insulator, heat from the accretion process was maintained below the Earth's surface, as each hot layer was subsequently covered by, and insulated by overlying accretion debris.

Answer 2

growth or increase by the gradual accumulation of additional layers or matter.