________ is the thin layer of rotting organic matter that covers the soil.

________ is the process of gradual disintegration of rocks by atmospheric or weather forces,such as rainfall and temperature.

___________ involves the disintegration of rocks without changing the chemical composition of rocks.

The vertcal section of the soil is called the ___________.

__________ is the process of the combination of oxygen with the rocks, which results in the formation of new chemical compound.

_________ is when soil is washed away by deep cut into hillsides by rain water.

__________ is also known as 'H' horizon.

___________ is caused by changes in temperature, pressure, crystal growth or by wind - blown sand.

Which type of forces originate from inside the earth?

__________ is a destructive process.