They provide evidence that movements of the crust are a result of slow moving currents in the mantle. Since earthquakes and volcanic eruptions are usually a result of stick-slip movements between 2 more plates and it is tension changes that are responsible for this sudden movement, the plates must be moving overtime or this tension would remain fairly constant.
1.The population is rising fast because of inadequate amount of knowledge about family planning. 2.Census is done to check the growth of our population. 3.
