Question

Why does density increases towards the centre of the earth? Explain

Answer 1

Example take a glass full of sand.

just apply pressure with your palm. You will see Glass become somewhat empty.

Now

density=mass/volume

By applying pressure volume become less

So the density increases.

Same in earth's case as we go down overlying weight(also pressure) increases thus density increases.

Answer 2

Dense material sank to the center, while the lighter material created the crust. 
That is why Density increases towards the center of the earth ..
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