Research shows that ancient rivers were broad straight sheets of water, but plant colonization changed water flow.
The first vascular plants took root because of the abundant water and began to hold sediment in place - creating riverbanks, thinning waterways. Paleozoic-era plants bunched together at the water’s edge and colonized the Earth. Over the next 50 million years this led to today's curving rivers and all the green we see around.
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