Question

Why does the density increase towards the center of the earth?

Answer 1

Okay, lets say there is a tower made by ten blocks. So assuming you know basics of gravitational force, the block on the top will not experience any force but it will exert force on the block below it due to it’s downward impending motion; which is caused by gravitation of earth. Now the system of those two blocks will apply force on the immediate next and the lowest will experience highest force.

But the system given in the example was a rigid object. What about fluids? The answer may be known to you, liquids gain pressure with increasing depth because there is more bulk applying pressure(or force for that matter) from above. Hence dams have broader base and without protective gear humans can easily get crushed below a certain depth in water.

Now, earth below the solid crust is magma, which is molten metallic mixture basically. So, a viscous fluid. Hence, does the density of earth increase with increase in depth

Answer 2

The Density increase towards the center of the earth because the immense pressure of overlying rocks and the presence of heavier materials.