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this consists of three separate layers of the Earth â the crust, the mantle and the core.
the time required for half the atoms present in an object have undergone radioactive decay and...
a group of very reactive chemical elements that readily lose their one valence electron to form...
(also called dative covalent bond) one atom contributes both electrons (or a lone pair of...
a substance that can donate or accept a proton. It can act as an acid or a base.