Caption: UW-Madison student Richard Becker samples rock near Lago Buenos Aires, Argentina. Samples of quartz-bearing rock from boulders deposited thousands of years ago by ice age glaciers in South America are providing scientists with clues to ancient climate and natural global climate change.
Photo by: courtesy Daniel Douglass
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Caption: Map at left shows ice extant for the last ice age (dark areas) in both the Northern and Southern Hemispheres. Map at right shows the area near Lago Buenos Aires, east of the Andes Mountains, where moraines, glacial features of the last ice age, have been dated by a UW-Madison team to show that ice ages occur simultaneously in both hemispheres, despite differences in solar radiation.
Image by: courtesy Michael Kaplan
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