What happens when soil erodes? minerals and salts release nutrients
minerals and salts float to the top
minerals and salts move across the land or leach downwards
minerals and salts clog streams and rivers

Paleontologists have found plant fossils deep within the layers of the north polar region. these leaf fossils have been labeled as to the rock layers they were found in, with the lower numbers being layers close to the earth's surface and higher numbers representing deeper layers. according to the numbers of these four leaf fossils, what might you infer?