Why do lakes Sometimes Disappear ?

Many lakes have vanished . Some have been filled up, the water of others has flowed away,
and other lakes in very hot countries have simply dried up.

Lakes can be filled up with material brought down by rivers. Deltas in a lake can eventually fill up the whole lake, which becomes an almost flat plain.Some lakes dry up because of evaporation, and some disappear and return, such as lake Eyre in Australia .It is Huge lake,but it disappears in dry weather.