Complete the sentences in these paragraphs describing the challenge of providing safe drinking water in different areas. People can't drink ocean water. However, in very dry areas near the ocean, people purify ocean water. They must use this process to obtain safe drinking water. The main substance that's dissolved in ocean water is salt, and it must be removed. Salt water is classified as a mixture. This kind of mixture can't be separated by The first ocean water purification method requires heating. This method, that water boils at a lower temperature than salt. The second method does not require heating. This method, Some parts of the world have contaminated water that causes diseases. Contaminated water has microorganisms, and forms a
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