[Q]: - The filter has small pores to catch pollutants - The filter will catch chlorine, heavy metals, and other chemicals - The filter allows water and mineral ions like fluoride to pass through - The water on the other side of the filter is much cleaner - What might be the first step of the process?
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[A]: Water comes through a filter

[Q]: - Water droplets are in clouds - The air gets cold - Water droplets turn into ice crystals - Ice crystals in clouds stick together and become snowflakes. What might be the first step of the process?
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[A]: Water evaporates from the ground up to the sky

[Q]: - The oxygen travels into the lungs - The oxygen binds to hemoglobin proteins within erythrocytes (red blood cells) - The erythrocytes are pumped through the body by the heart - All cells receive the oxygen. What might be the first step of the process?
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[A]: Oxygen enters the body through the mouth or nose

[Q]: - Aluminum flows into streams and lakes - Acid rain dissolves minerals and nutrients in soil - Washes them away so plants can't benefit from them - PH in soil and water gets affected which can kill plants and animals - Acid rain in fog at higher elevations can strip foliage off trees. What might be the first step of the process?
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[A]:
Acid rain leaches aluminum from clay particles in soil