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Grade 5
Topic Cloze Quiz
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Earth’s Atmosphere
One cause of air pollutants is burning
fossil fuels
aerosol
CFCs
fires
Select your answer
, including gasoline. Natural events such as grass and forest
Ozone
fires
radation
breathing
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spread smoke. A mixture of smoke and fog known as
Ozone
smog
aerosol
fires
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covers cities like a brown cloud. It can kill people who have problems
breathing
Ozone
aerosol
radation
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. Humans have poked holes in the
fossil fuels
Ozone
smog
CFCs
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layer. These allow harmful UV
fires
Ozone
radiation
smog
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through. Substances called
CFCs
Ozone
fires
fossil fuels
Select your answer
leak from appliances and probably produce these holes. These substances were once used in
breathing
smog
aerosol
CFCs
Select your answer
spray cans.