Answer:
Natural sources include decomposition, ocean release and respiration. Human sources come from activities like cement production, deforestation as well as the burning of fossil fuels like coal, oil and natural gas.
Explanation:
Answer: Air
Explanation: Pure air is a mixture of several gases that are invisible and odorless. Consists of 78% nitrogen, 21% oxygen, and less than 1% of argon, carbon dioxide.
Answer:
A directory of relatives' phone numbers
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Explanation:
Energy is not created or destroyed due to the law of Conservation of Energy. Hope this helps!
the combustion of fossil fuels and the smelting of sulphide ores and volcanic emissions.