Rivers today have high muddy banks, sandbars and bends. But they didn’t always look that way. Because it wasn’t until the evolution of tree-like plants, some 330 million years ago, that rivers were corralled into their current form. Before that, ancient waters flowed wide and shallow over the land, with little to constrain them other than mountains. So says a study in the journal Nature Geoscience . [Neil S. Davies and Martin R. Gibling, Evolution of fixed-channel alluvial plains in response to Carboniferous vegetation ] [More]
donderdag 25 augustus 2011
Modern Rivers Shaped By Trees
Modern Rivers Shaped By Trees:
