[Q]: - 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 What might be the last step of the process?
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[A]: The polluted rain becomes acid rain.

[Q]: - 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 What might be the last step of the process?
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[A]: The polluted rain becomes acid rain.

[Q]: - Air goes into the lungs - The lungs remove oxygen from the air - Oxygen diffuses from alveoli in the lungs to the bloodstream - Hemoglobin in red blood cells attaches to the oxygen - Red blood cells carry oxygen all around the body What might be the last step of the process?
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[A]: Oxygen diffuses into cells from capillaries.

[Q]: - An organism dies - Water seeps into the remains - Minerals dissolved in the water form crystals - Crystalized minerals cause the remains to harden What might be the last step of the process?
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[A]:
The minerals form a fossil.