[Q]: - Chemicals like sulfur dioxide and nitrogen are released into the air - These substances rise into the high atmosphere - They react with water and oxygen - This creates a more acidic rain What might be the last step of the process?
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[A]: The rain with the high acid content falls.

[Q]: - Greenhouse gases are released into the air by human activities - The earth changes energy from the sun into heat - Heat rises from the ground - Greenhouse gas molecules in the atmosphere prevent the heat from going into space - The temperature of the earth increases - The temperature continues to rise and melts the polar ice caps What might be the last step of the process?
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[A]: The temperature rises even faster.

[Q]: - Magma rises through cracks in the Earth's crust - The pressure causes plates to move - Magma explodes to the surface - The lava from the eruption cools to form new crust What might be the last step of the process?
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[A]: After several eruptions, the rock builds up and a volcano forms

[Q]: - Air enters the lungs through bronchial tubes - Air enters bronchioles - Bronchioles have tiny air sacs called alveoli - Alveoli surrounded by small blood vessels - Oxygen absorbed by small blood vessels - Vessels deliver oxygen to every cell in the body - Blood brings carbon dioxide back to lungs What might be the last step of the process?
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[A]:
Carbon dioxide released when you exhale.