Fill in the blanks:

1. __________ are the vast stretches of water surrounding the land masses.
2. About three fourths of the world's active volcanoes lie in the ________ Ocean.
3. __________ is the busiest Ocean in the world.
4. __________ is also called Half an Ocean.
5. Large bodies of water surrounded by land on all the sides are called ___________.
6. __________ is the largest lake in the world.
7. In its middle course, a river leaves the ___________ and enters the __________.
8. In its lower course, the river forms ___________.

Match the following:

Name the four oceans of the World. List two characteristic features of each.

Name the landforms formed by river in the course of its journey from the hills to its mouth.

What is the importance of water bodies in human life?