Answer:
movement in tectonic plates. or volcanic eruptions.
Explanation:
Al-72 is unlikely. it is farther away from any other isotope.
Answer:
ridge push and slab pull
Explanation:
there are two processes through to be responsible for the spreading seen at mid ocean ridges and there is some uncertainty as to which is dominant. ridge push occurs when the weight of the ridge pushes at the rest of tectonic plate away from the ridge often towards a subduction zone. hope this helped
