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gas consisting mainly of methane and carbon dioxide, which is produced as a result of decomposition in landfills.
a very long time span in the Earth's history, covering tens or hundreds of millions of years....
simple inorganic chemical substances (mineral salts) that are needed in very small amounts for...
ecotourism that is carried out thoughtfully, morally and in a way that is acceptable to all...
a clear, colourless solution of hydrogen chloride (HCl) in water. It is a strong and highly...