input question: What is the final step of the following process: - People dig up coal from the ground - People burn coal for heat or electricity - Pollution from the coal goes into the sky - Coal pollution enters clouds - Clouds rain over an area???
output answer: The polluted rain becomes acid rain.

What is the final step of the following process: - Air is pulled into the lungs - Oxygen moves from the lungs into the bloodstream - Air is pushed through the vocal chords - A person talks
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Answer: Other air is pushed out of the lungs into the environment.

Q: What is the final step of the following process: - Air is brought in through the mouth - Passes through the lungs - And into the bronchial tissue - The carbon dioxide is removed
A: The lungs bring the oxygen to the rest of the body.

Question: What is the final step of the following process: - Boil salt water - The water will turn into water vapor - Collect the water vapor - Allow the water vapor to cool - The water vapor will turn into liquid water
Answer: The salt will be separated from the water.

[Q]: What is the final step of the following process: - Minerals fill spaces between bits of sediment - The sediments become glued together - The glued together parts become hard like cement - The sediment becomes a big rock - The rocks erode slowly - The rocks come apart - The rocks become smaller rocks - The rocks continue to erode into smaller rocks
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[A]: The process starts again.

Problem: Given the question: What is the final step of the following process: - Water evaporates from the ground up to the sky - Water droplets are in clouds - The air gets cold - Water droplets turn into ice crystals
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The answer is:
Ice crystals in clouds stick together and become snowflakes.