Mars has its own ...

(a)  

Mars's ... includes features

(a)  

 It has the largest ... storms

(a)  

These scientific ... have been able to detect real proof that life is possible there.

(a)  

one of the ... requirements for life, the existence of some form of water

(a)  

A ... amount of ice is under the surface

(a)  

It has the largest dust storms, the deepest and longest ...

(a)  

How many planets are there in the Solar System?

Which planet is the nearest to Earth?