I think I understand your question, but you question has so many errors in it that it doesn't really make sense.
Answer:
C.
The total mass of the particles in the system stays the same. sorry if i am wrong
Explanation:
Im just guessing so i think its a
The answer will be for you U
I believe you mean mid-ocean ridge?
If so, true.
A mid-ocean ridge or mid-oceanic ridge is an underwater mountain range, formed by plate tectonics.
This uplifting of the ocean floor occurs when convection currents rise in the mantle beneath the oceanic crust and create magma where two tectonic plates meet at a divergent boundary.
A mid-ocean ridge demarcates the boundary between two tectonic plates, and consequently is termed a divergent plate boundary.