Fill in the blanks with suitable words :

Earth was a hot revolving ball of________ about 4.6 billions of years ago.

Earth was a hot revolving ball of gas about 4.6 billions of years ago.

Explanation: Formation of earth had taken 4.6 billion of years ago and at that time no life form existed over here. It is a huge mass of gas with extreme temperature and dry climate. Due to these characteristics of the earlier earth, it is called that earth was a hot revolving ball of gas about 4.6 billions of years ago.