_______ is also known as the parent bedrock.

The second layer is the ___________.

The external forces try to reduce the elevations and fill up the depressions on the surface of the earth process is known as _________ .

__________ is the unweathered layer of the soil.

The __________ is formed in horizontal layers or horizons.

__________ which is the unfertile partly weathered rock.

____________ involves the decay of rocks, which cause changes in their chemical composition.

The layers or horizons of soil are determined by ___________.

Gradation is broadly divided into _________ types.

_________ happens when the composition of the rocks are chemically altered.