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During the drinking water treatment process, a chemical is added at the stage so that suspended particles, such as mud and sediment, will stick together, settle out, and can be removed. a.aerationb. chlorinationc. coagulationd. softening
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Where was oil production at its highest in the 1980s and still remains important to the russian economy? central asia the ural mountains russian siberia the caucasus region
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How did geography influence the settlement of early africa.
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