Fill in the blanks :
1.The two main gases present in the air are ____________________and ______________________.
2.Animals need ____________________ gas for breathing.
3.____________ use carbon dioxide gas to prepare their own food.
4.The process by which plants prepare their own food is called.
5.Ozone gas,present in atmosphere,protects us from the harmful rays of sunlight.
6.Air containing impurities is called __________________.
7.Air is an invisible mixture of __________________.
8.The amount of water vapour present in air determines the ________________ of air.
9.The oxygen present in air is used to produce ___________________ from the food that is eaten.
10.Nitrogen gas present in the air is converted into _________________ and________________ salts with the help of bacteria.
11.If these gases are present in the excess in air their increased greenhouse effect can cause _______________.
12.The movement of earth around the sun is known as _____________________.
13.The circular path of planet is known as _____________ of the planet.
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