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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 clear glassy material possessing good heat and electrical insulating properties.
the scale used to compare the masses of atoms. Atoms are compared to carbon-12 atoms.
types of chemical âunitsâ â could be atoms, molecules, molecular fragments, simple or...
an atom of an element that loses or gains an electron and becomes electrically charged.