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What causes red soil and yellow soil to differ in colour, given they share the same parent rock?

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1. What causes red soil and yellow soil to differ in colour, given they share the same parent rock?

Oxidised iron gives red; hydrated iron oxide gives yellow

Red soil has more organic matter; yellow soil has none

Yellow soil forms only at high altitude; red soil at sea level

Red soil contains gypsum; yellow soil contains mica

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