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a group of elements that are poor conductors of heat and electricity.
a substance that can donate or accept a proton. It can act as an acid or a base.
materials that exhibit strong magnetic effects; form magnets or are attracted to magnets
the sphere or region of the Earth that consists of water, which is found as liquid water (...
the stratosphere extends from a height of 10 km to 50 km above the surface of the Earth.