Question

which material is an aquifer layer most likely made of?
soil
clay
solid granite
cracked rocks

Explanation:

An aquifer is a geological formation that can store and transmit water. Soil has pores that can hold water, but it may not be as effective as cracked rocks in transmitting water. Clay has very small pores and is often impermeable, so it is not a good aquifer material. Solid granite is also impermeable. Cracked rocks, on the other hand, have fractures that can allow water to flow through and be stored.

Answer:

cracked rocks