A standard rain gauge consists of a metal canister open at the top in which a funnel drains rainwater into a narrow cylinder. Each time they are deployed to the field, a small amount of light oil is added to the cylinder. This is done to:
W) deter birds from drinking the water
X) stop the canister from oxidizing
Y) prevent the growth of blue-green algae
Z) prevent water evaporation
✔️Answer:Z) PREVENT WATER EVAPORATION
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