What is the mineral deposited in the soil of the lower hills and valleys in the sand?
• 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.
(80.95) (1/4) + (3.05) 3 - 119.78 × 2.15 + (14.98)2 = ?
18.22 × 7.99 + 156.15 = ?
(98.03 + 186.98) ÷ 19.211 = 89.9 – 20.23% of ?
(1011 × 4.465 + 1012 × 0.3535) ÷ (160 × 10⁵) = 10? ÷ 2
...(899.117 + 1.1121) X 72.731 = ? + 49.95 X 64.78 + 29.50
24.99% of 1619.78 + (1259.84 ÷ 12.24) = ? × 16.98
124.88% of 1199.85 + 99.99 ÷ 3.99 = ?
(22.03 + 89.98) ÷ 14.211 = 89.9 – 25.23% of ?
(?)2 = (5.99)2 + (7.88)2 + 43.99