
LOWA is the state which is bordered by the Mississippi River on the east , the Missouri River and the Big Sioux River on the western side .
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Oxidation - the breakdown of rock by oxygen and water, often giving iron-rich rocks a rusty-coloured weathered surface.
The mountainous regions could not develop agriculturally as much as fields
Until the early Proterozic there were only negligible amounts of free oxygen in the atmosphere