Intext questions XII — task. Science CBSE, Class 9.

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1. What is the greenhouse effect?

Some prevent heat from escaping from the Earth. The greenhouse effect is caused by an in the amount of these gases in the atmosphere, which causes global average temperatures to rise.

2. What are the two forms of oxygen found in the atmosphere?

Upper atmosphere: Ozone and it is the poisonous form of oxygen
Upper atmosphere: Oxygen ( $O$ ) and it is a poisonous form
Lower atmosphere: Diatomic molecule of oxygen ( $O_2$ ) and it is non-poisonous form
Upper atmosphere: Diatomic molecule of oxygen ( $O_2$ ) and it is non-poisonous form
Lower atmosphere: Ozone and it is the poisonous form of oxygen
Lower atmosphere: Oxygen ( $O$ ) and it is non-poisonous form

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12. Intext questions XII

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