* Bedrock: This is the solid, unweathered rock that lies beneath the soil and other loose sediments. It's the parent material from which soil is formed.
* Residual Soil: This is soil formed in place by the weathering of bedrock. It's essentially the weathered, broken-down version of the bedrock.
Therefore, bedrock is the source of residual soil, not the other way around.
Think of it like this:
* Bedrock: The original rock, like a solid granite block.
* Residual Soil: The crumbled, broken-down granite particles, which are a result of weathering.
While residual soil is formed from bedrock, it is a distinct layer itself. It's the product of weathering and the beginning of the soil-forming process.
