Water may not contain much impurity if its source is (A) Reservoirs (B) Stream flowing in plains (C) Lakes in lower regions (D) Spring along hill slopes

Water may not contain much impurity if its source is 

(A) Reservoirs 

(B) Stream flowing in plains 

(C) Lakes in lower regions 

(D) Spring along hill slopes

by

1 Answer

Answer :

(D) Spring along hill slopes

by

Related questions

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