The primary step in Wastewater treatment includes Treating water with Chlorine and UV light
o Sending the water back to people's houses
Removing larger items from the water using screens
and settling tanks
o Using Bacteria to Remove Waste from the Water

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answer: collecting information/data

reason: the student is going around and asking people questions to collect data

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answer: ice crystals in air

the water from the water body or another source of water gets evaporated as water vapor as an effect of heat on water. these water vapor rises in the upper layers of the earth atmosphere under high atmospheric pressure. the atmospheric pressure of these water molecules starts to decrease due to the effect of cold air. the invisible water vapor condenses into visible water droplets and ice crystals.these ice crystals and water droplets being less denser than the surrounding air floats on air as clouds.