OUR IRON ORE: A BILLION YEARS OLD MOUNTAINS, VOLCANOES, SEAS ... Hometown Focus The piece I'm sharing with readers here was developed by the Minnesota DNR and is based on the book Minnesota's Geology, by Richard Ojakangas and Charles Matsch (Minneapolis: University of Minnesota Press, 1982). Geologic timeline. MN DNR. Imagine a ... |
from development of earths oceans - Google News http://ift.tt/1sMgIzk
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