Environmental Science
Biogas is composed of

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

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Environmental Science
When a liquid thermometer is held in direct sunlight,

It will measure the temperature of the sun rather than the air
It will measure a much lower temperature than that of the air
It will accurately measure the air temperature
It will measure a much higher temperature than that of the air

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