<span>When a river overflows its banks, it deposits sediment over a broad, flat area of land on both sides of the river. This broad flat area is called a floodplain. Floodplains usually have </span><span>areas of higher elevation on both sides</span>
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Answer what are you asking
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Explanation:
If a sample is impure, it means it contains multiple substances, this means that when you test it in a flame test, it will come up with a mixed color meaning you wont be able to tell what ions are in the substance.