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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 solid that forms as a product of the reaction between two aqueous solutions.
the smallest particle of an element that can exist on its own (the basic building block of...
a clear glassy material possessing good heat and electrical insulating properties.
electrons that have been emitted from the nucleus of an atom of a radioactive element.