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• Placer deposits are formed by the concentration of a particular metal or mineral over a period of time. • The river while flowing through the rocks extract the minerals from there and they are deposited downstream under the influence of gravity. • These deposits are a result of depositions made by water, therefore placer deposits are found in or near subaqueous environments. • They are found in or near water bodies also in the sands of ancient river channels, dried valleys, beaches and coasts. • Generally, the inert metal like Gold and Platinum forms these kinds of deposits. • The reaction resistant ores like magnetite, monazite, zircon and rutile are also found in placer deposits. • The coastal plains of Alaska, India, NewZealand, Indonesia and South Africa are rich in placer deposits.
Select the option that will fill in the blank and complete the given series.
ABCD, ________, ΧΥΖΑ, XXXX, UVWX, UUUU
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