Question

how can you say that the earth is still very active

Answer 1

earth is now in a sesismically active period according to quake cluster theory

Answer 2

Answer: We can say earth is still very active because the matter from deep inside the mantle shoots up through volcanoes and fissures on the ocean floors and cools down to form the earths crust. In many regions on the earth, part of the earths crust enters into and once again become molten. This constant process of formation and destruction of the crust explain the fact that our earth is still active. We can also say that the earth is still active due to natural disasters like cyclones, sand storms, floods,etc.