Marcia Bjornerud is a Professor and Chair of Geology at Lawrence University. She is a Fellow of the Geographical Society of America, and was a 2000-2001 Fulbright Scholar. She lives in Appleton, Wisconsin.
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Few of us have any conception of the enormous timescales in our planet's long history, and this narrow perspective underlies many of the environmental problems we are creating for ourselves. The passage of nine days, which is how long a drop of water typi... SEE MORE