3. Observe the ovals in the box given below and answer the questions.
a. Cross out the substances which make water non-potable.
mud
algae
germs
salt
minerals
b. Classify the impurities given above into the two categories mentioned in the table
below:
Visible impurities
Invisible impurities
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Answer:
a )mud algae germs salt
b)visible -mud alge
invisiible-germs salt minerals
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