Environmental Science
If all the water vapour in the atmosphere were to condense and fall to the ground, the globe would be covered with about ______ of water.

1 foot
1 millimeter
1 meter
1 inch

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Environmental Science
Biogas is composed of

ethane, carbon dioxide, nitrogen and hydrogen
methane, carbon dioxide, nitrogen and hydrogen
carbon dioxide, nitrogen and hydrogen
methane, carbon dioxide, nitrogen and sulphur

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