Question

which describes the composition of the ocean floor?
a. basalt on top of a layer of sediment
b. sediment on top of a layer of basalt
c. sediment on top of a layer of granite
d. granite on top of a layer of sediment

Explanation:

The ocean floor is composed of sediment (such as clay, silt, sand, and the remains of marine organisms) that accumulates over time. Beneath this sediment layer is basalt. Basalt is a common volcanic rock that forms the oceanic crust. Granite is more associated with continental crust.

Answer:

B. Sediment on top of a layer of basalt