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Contunico © ZDF Studios GmbH, MainzOverview of Qatar.
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Encyclopædia Britannica, Inc.Offshore oil platform and oil pumps in southern Chile.
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Encyclopædia Britannica, Inc.Ions—atoms with a positive or negative net charge—bind together to form ionic compounds.
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Contunico © ZDF Studios GmbH, Mainz; Thumbnail © David Webb/Dreamstime.comLearn about the environmental impact of tar-sand (also called oil-sand) extraction, with a focus on Canada.