4.A ------------------- is a low lying area between 2 mountains or hills.

(a)  

5.A land surrounded by water on all sides is called a-------------------

(a)  

Sun and the planets together form the ---------------------------------

(a)  

If we observe the ---------------------- through the month,we will find that its shape seems to change.

(a)  

The highest point of a mountain is known as----------------

(a)  

9.The weather is very --------------------------- on the hills.

(a)  

10.-------------------- are hot and dry lands covered with sands.

(a)  

11.The top of ------------------------------ resembles the shape of a table.

(a)  

-------------------------- is known as "blue planet".

(a)