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

Correct option is D

The Correct Answer is D: 5-10 km.

Explanation:

• The oceanic crust is primarily composed of basalt and extends 5-10 km beneath the ocean floor.
• It is denser than the continental crust and is typically younger.
• It is formed at mid-ocean ridges through volcanic activity, continuously renewed.

Key Points:

• Oceanic crust is formed at mid-ocean ridges and spreads outward.
• It is younger, typically 200 million years old, compared to the much older continental crust.
• Oceanic crust is denser, which is why it lies below sea level.