Question

what is the crust beneath the ocean basins composed of ??​

Answer 1

Answer:

oceanic crust

Explanation:

the answer is oceanic crust

Answer 2

Answer:

Oceanic crust, extending 5-10 kilometers (3-6 kilometers) beneath the ocean floor, is mostly composed of different types of basalts. Geologists often refer to the rocks of the oceanic crust as “sima.” Sima stands for silicate and magnesium, the most abundant minerals in oceanic crust. (Basalts are a sima rocks.)