What three things can happen when 2 tectonic plates spread apart?

When two tectonic plates spread apart, three key events can occur: first, magma from the mantle can rise to fill the gap, leading to the formation of new oceanic crust through volcanic activity. Second, this process can create mid-ocean ridges, which are underwater mountain ranges. Lastly, the spreading can induce earthquakes as the plates move away from each other, releasing built-up stress along faults.