The figure above shows how water supplied to houses in cities is made fit fordrinking.
The cleaning of water often happens in several steps, involving different techniques. The cleaning
process shown in the figure involves four steps (numbered 1–4). In the second step, the water is
collected in a settling pond.
Question 9: In what way does this step make the water cleaner?
A bacteria in the water die.
B Oxygen is added to the water.
C Gravel and sand sink to the bottom.
D Toxic substances are broken down
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Answer:
by filtration gravel and sand sink to the bottom
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Answer:
D)Toxic substances are broken down.
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