Question

How does the density change as depth increases with the earth?

Answer 1

Density is the measure of the amount of mass can be kept inside the volume. Hence the density is described as mass by volume. The objects less in density are said as light objects. The objects which have high density are heavier objects. The mass changes the properties of the objects. In the same way, the density also changes the behaviour of an object.

Complete step by step answer:
(i) When the depth of the earth increases, the pressure acting on the earth also increases. Increasing the depth is simply applying force over the particular area. We know that the pressure is the measurement equals the force by area.
(ii) If the pressure increases indicates the reduction in volume. We know that the density,$\rho = \dfrac{m}{V}$
(iii) The m indicates mass and V indicates volume. The density is directly proportional to mass and inversely proportional to the volume. Therefore, when the volume decreases, the density increases.
(iv)Therefore the density increases when the depth increases with the earth.
(v) The high density objects are heavier objects. Therefore the increase in depth causes the earth to be heavier. The heavier objects create much gravitational pull over other objects. As the sun is heavy, it keeps holding the planets around it through its gravitational pull. Because $\rho \propto \dfrac{1}{V}$can be understood from the previously mentioned formula.

Note:
(i) The increasing depth causes the earth density to increase. The earth becomes heavier. When the earth becomes heavier, the earth would be much hotter, increasing volcanic activity etc. The earth might not be a suitable place to live. The shape of the earth could also get change.
(ii) The concept of twice the size of earth is called ‘super earth’. In super earth, life is less possible.