What is cement to a geologist?

a. the material used to make buildings and sidewalks
b. a natural form of glass
c. a collection of interlocking grains
d. the mineral materials that bond grains together

d. the mineral materials that bond grains together

Explanation:

The cement to a geologist is the building material that is bonded by the sold rais and that hardens the other materials and binding the sand and the gravel together. And It's the most widely used materials for the binding of most consumer resources and it gets quickly hardened form the chemical attacks

Themes; subfields is the answer