Here's why:
* Unweathered rock is the bedrock. It's the solid, unfractured rock that lies beneath the soil.
* Subsoil is a layer of soil. It's typically found beneath the topsoil and above the bedrock.
* Subsoil can be weathered rock. Over time, the bedrock can weather and break down into smaller particles, forming part of the subsoil.
Therefore, unweathered rock (bedrock) is not the same as subsoil. However, weathered bedrock can contribute to the formation of subsoil.
To summarize:
* Bedrock: Unweathered rock.
* Subsoil: A layer of soil containing minerals and organic matter.
* Relationship: Weathered bedrock can contribute to the formation of subsoil.
