Introduction Photography First place Second place Honorable mention Multimedia First place Second place Third place Honorable mention Illustration First place Second place Honorable mention   The judges		Credit: D. Tasa, F. Pazzaglia; Tasa Graphic Arts/Lehigh University. Milankovitch Cycles Dennis Tasa, Frank Pazzaglia To introduce students to natural climate variability, Dennis Tasa of Tasa Graphic Arts in Taos, New Mexico, animated a series of lessons on the Milankovitch cycle -- climate shifts caused by variations in Earth's orbit around the sun. Students can learn about the three major components of the cycle: eccentricity, the shape of Earth's orbit; obliquity; the tilt of Earth's axis; and precession, or wobble of Earth's axis. The lesson ends by showing how shifts in the ratio of oxygen isotopes in ice cores, which represent climate change over thousands of years, match Earth's orbital wobbles and wanderings. See an excerpt from the interactive CD-ROM (3.6 MB; Shockwave plug-in required)
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