Red sea is an example of:

Detailed Solution:

The correct answer is “Axial trough”.

The Red Sea is an example of an axial trough.

An axial trough is a long, narrow depression in the Earth's crust that forms along a divergent plate boundary. In the case of the Red Sea, the Arabian Plate and the African Plate are moving apart, creating a rift valley that is gradually widening and deepening.

The Red Sea is a part of this rift valley.