Answer:
The first layers of earth are very loose, unconsolidated layers called soil, which is pretty easy to dig into, but as we go deeper we reach the bedrock, which is the hardest part of the soil profile, which is made of hard rocks and matter.This makes it harder to dig more and more deeper.
Explanation:
The soil located on top of a mountain differs essentially from lowland soils due to the process of their origin and their morphological and chemical characteristics.
I believe your answer is E
