Question

Which material is an aquifer layer most likely made of?

soil
clay
solid granite
cracked rocks

Answer 1

An aquifer layer is most likely made of **cracked rocks** or permeable materials such as sand, gravel, or sandstone. Aquifers need to have sufficient porosity and permeability to allow water to flow through them. While clay typically acts as an impermeable layer and solid granite can be impermeable as well, cracked rocks can often provide the necessary pathways for water movement. Therefore, among the options you provided, **cracked rocks** would be the best choice for a material that can form an aquifer layer.