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In spite of the low temperatures in parts of the United States last month, 2018 experienced globally the third warmest April in 138 years of modern record-keeping, according to a monthly analysis of global temperatures by scientists at NASA's Goddard Institute for Space Studies (GISS) in New York

For over 20 years, satellite altimeters have measured the sea surface height of our ever-changing oceans.  This series of images shows the complicated patterns of rising and falling ocean levels across the globe from 1993 to 2015.

An animation showing “sea level fingerprints,” or patterns of rising and falling sea levels across the globe in response to changes in Earth’s gravitational and rotational fields. Major changes in water mass can cause localized bumps and dips in gravity, sometimes with counterintuitive effects.

The advance-and-retreat cycle of snow cover drastically changes the whiteness and brightness of Earth. Using these two 2017 maps created using NASA satellite data, have students review the seasonal differences of snow and ice extent.

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