[Q]: 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
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[A]: The polluted rain becomes acid rain.


[Q]: What is the final step of the following process: -  Acid rain flows through soil - Chemicals from the acid rain kill plants and trees - The acid rainwater flows into rivers and streams - The chemicals kill fish - The chemicals kill animals that drink the water - Nitrogen builds up
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[A]: Nitrogen destroys fish and shellfish populations.


[Q]: What is the final step of the following process: -  Coal is burned in a boiler - Steam is produced under pressure - Flows into a turbine - The turbine spins
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[A]: Creates electricity.


[Q]: What is the final step of the following process: -  Cells obtain glucose and oxygen - The glucose and oxygen create carbon dioxide - The cells release energy - The cells don't have enough oxygen to repeat this - The cells obtain more oxygen from the air
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[A]: