Question

Why are divergent plate boundaries called constructive

Answer 1

When they move apart magma rises up in the gaps I think

Answer 2

They are called constructive plates because

Step-by-step explanation:

They are called constructive plates because when they move apart, magma rises up in the gap- this forms volcanoes and eventually new crust. One example is the Mid-Atlantic Ridge, where the gap can be found in Thingvellir, Iceland.