What can cause a secondary succession to occur?

It occurs because if we let the trees on fire. But, still there is roots left in the plant. So, that's why it make new grasses and then, it turns in huge trees and it happens again and again.

come on.. anyone have an answer?

Succession occurs when like a volcano erupts and the land is covered with the volcanic rock and no plants can grow. Then, it takes many years for plants and animals to be restored. Also, like when a...

Secondary succession occurs on previously occupied sites following a disturbance.

forest fires, an abandoned field, a tree-felling,etc