1. A. In unfractured granite the porosity may be as low as 1 percent hence water cannot easily
pass through hence contribute to the formation of aquiclude which is a completely impermeable
B. Fractured granite contributes to aquifer formation due to their high porosity and
permeability for water. These aquifers are the main sources of water for mountain communities.
C. Beach sand has low porosity but high permeability. High porosity is required for good
water storage and hence aquifer formation.
D. Glacial till has relatively low porosity which reduces the water retention capacity required
to form an aquifer.
E. fluvial gravel form the best aquifers. It has high porosity allowing water movement
between the grains of varying sizes.
F. shale or mudstone have pores that are not connected making it difficult for water to enter or
leave these rocks. The can contribute to the formation of impermeable aquitards.
g. limestone ha...
15 Million Students Helped!
Sign up to view the full answer