There is a spontaneous change from liquid to vapour state and back to liquid state at the point of fall of waterfall.

What is the principal method of stream erosion and involves wearing away of the bedrocks?

Charles Darwin classified coral reefs into how many classes?

Every major river is associated with a valley of its own.

A typical delta is made of how many layers?

The fore-set beds are intermediate layers.

The distance water travels in a unit time is ______

Which among the following is not true about cavitation?