Which of the following forms the bottom layer in the filtration tank in the purification and supply of drinking water in a city?

Coarse sand layer

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Clayey sand layer

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Fine sand layer

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Gravel layer

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Solution

The correct option is D
Gravel layer

Gravel (tiny stones) forms the bottom layer in the filtration tank in the purification and supply of drinking water in a city.

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Which of the following forms the bottom layer in the filtration tank in the purification and supply of drinking water in a city?

The correct option is D Gravel layer Gravel (tiny stones) forms the bottom layer in the filtration tank in the purification and supply of drinking water in a city.

The correct option is D
Gravel layer

Gravel (tiny stones) forms the bottom layer in the filtration tank in the purification and supply of drinking water in a city.