Explain the concept of “survival of the fittest.”

The Definition Of Survival of the Fittest is:

the continued existence of organisms that are best adapted to their environment, with the extinction of others, as a concept in the Darwinian theory of evolution.

it's basically postulating that those who are eliminated in the struggle for life are unfit for the challenge and opportunity.

meteorologists would compare a new weather map with one 24 h old to see how fast a front is moving.

answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.