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This interactive NASA webpage displays images of Arctic ice in 1980 and 2012. To facilitate comparison, the visitor can sweep a vertical line from left to right to reveal all of one image or all of the other. Text provides information about the rate of loss of ice and how it is defined.
<a href="http://www.compadre.org/portal/items/detail.cfm?ID=12731">Goddard Space Flight Center. NASA Finds Thickest Parts of Arctic Ice Cap Melting Faster. Greenbelt: Goddard Space Flight Center, 2012.</a>
Goddard Space Flight Center. NASA Finds Thickest Parts of Arctic Ice Cap Melting Faster. Greenbelt: Goddard Space Flight Center, 2012. http://www.nasa.gov/topics/earth/features/thick-melt.html (accessed 29 July 2016).
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