Gondwanaland was named by 

The earth's crust surrounded by the thick blanket of air is 

________ are the result of strain in the rocks of crust and mantle.

As we go deep into the interior of the earth, the temperature increases but as we go deep into water, temperature _______.

First life originated from

________ type of rock is contained in the crust under the continents.

 Which among the following is a unit of distance for expressing astronomical distances?

In the outer core of the earth, iron exists in a _________ condition .

The petrified remnant of a past life is called  

Name the supercontinent in the Northern Hemisphere about 400 million years ago.