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The environment

Across
cease to be visible.
of Earth is the layer of gases, commonly known as air, that surrounds the planet Earth
a gradual increase in the overall temperature of the earth's atmosphere
An amount of gas or vapour that smells strongly or is dangerous to inhale.
Down
is the introduction of contaminants into the natural environment that cause adverse change.
gases ejected from an engine as waste products.
move from a lower position to a higher one; come or go up.
the surroundings or conditions in which a person, animal, or plant lives or operates.
is characterised by slower speeds, longer trip times, and increased vehicular queueing.