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this consists of three separate layers of the Earth â the crust, the mantle and the core.
the stratosphere extends from a height of 10 km to 50 km above the surface of the Earth.
a substance that can lose a proton in an acid-base reaction.
a molecule that is so big that we can see it, e.g. diamond.
a solid network of atoms making up a large crystal with covalent bonds between the atoms.