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the sphere or region of the Earth that consists of water, which is found as liquid water (surface and underground), ice (polar ice, icebergs and ice in frozen soil layers called permafrost), and water vapour in the atmosphere.
a reaction in which more energy or heat is released than absorbed when the reaction takes...
reactions that cause the surroundings to cool. Heat is taken in.
the number of protons in the nucleus of an atom, which determines which element it is. In a...