Chemistry
Where does the oxygen that keeps us alive come from?

Carbonates absorbed from soil
Water
Oxides of minerals
Carbon dioxide

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Chemistry
What are the components responsible for acid rain?

Nitrogen monoxide (NO) and Carbon monoxide (CO)
Sulphur dioxide (SO2) and Nitrogen oxides (NOx)
Oxides of carbon (COx) and Oxides of nitrogen (NOx)
Carbon dioxide (CO2) and Carbon monoxide (CO)

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