III Answer the following questions in one sentence.
1. What are CFCs?
2. Define global warming.
3. Name two diseases caused by drinking contaminated water.
4. List two chemicals used to purify water. 5. Mention any two greenhouse gases.
Answers
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Answer:
1 ans: chloro fluoro carbon
2ans: global warming is the unnatural rise in the temperature of the earth surface due to increased amount of green house gases in the earths atmosphere
3ans:cholera
typhoid
4ans: chlorine and chloramine
5ans: carbondioxide and methane
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