_________ which means building up and adding up of materials,there by increasing the height of low landforms.

________ is a mineral rich layer.

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

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

__________ is a process which gradually wears down the higher places and carries away the weathered materials from the place of its origin to its next resting place.

__________ is also known as 'H' horizon.

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

The decomposition of dead organisms also take place mostly in the _________.

The second layer is the ___________.

_________ becomes a weak carbonic acid, which reacts chemically on limestones and disintegrates them.