Waves that hit a fixed boundary return to the starting point on the side that it began

A. Opposite

B. same

A: Opposite

Explanation:

From Newton's third law of motion, to every action there is an equal an opposite reaction. Thus, when the wave hits a fixed boundary, it is returned as a reflected wave to the starting point albeit on the other side.

good for her? ? where is the question?

asthenosphere and convection