Question

The oceanic crust is mostly made up of different types of basalt which extends how many kilometres beneath the ocean floor?

• A. 10-17 km
• B. 15-22 km
• C. 2-5 km
• D. 5-10 km

Answer 1

Answer:

D. 5-10 km

• The oceanic crust is predominantly composed of basalt, a dark-colored, fine-grained extrusive igneous rock. • While basalt is the primary component, other mafic rocks like gabbro (its intrusive equivalent) are also found. • The oceanic crust is generally thinner but denser than the continental crust.