Nhờ sửa bài giúp

Parent material is the initial mineral substance that forms a soil.

It is derived from the weathering of rocks and may reside at the site of its origin or be transported from somewhere else to its current location.A soil formed from parent material found at the site of its origin is called a residual or sedentary soil.

Bedrock weathering in place produces a stony, massive material called saprolite.

As physical and some chemical weathering occur, the saprolite becomes denser than the underlying bedrock.

The texture and original rock structure remain, but the material is soft enough to dig with a hand shovel.

As chemical weathering converts primary minerals to secondary minerals, particles are redistributed vertically.

As material is both added and removed, a soil develops.

A residual soil will retain many of the characteristics of the underlying bedrock.

Also the texture, mineralogy, pH, and other characteristics of the soil may be a direct result of the saprolite below.