Typically, the lower part of the soil is soil cutting total density is higher than the Earth, is now on the bottom step, because the particle size of clay over and over from the weight of pressure now on the ground.
Typically, the soil beneath the soil bulk density is higher than the upper soil. Due to the lower amount of clay over. The pressure from the weight of the upper soil.
Usually the soil when the bottom of the page will be cut soil bulk density is higher than the upper soil Due to lower volume particle size clay. And pressure from the weight of the soil in the upper