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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.

Helping students build their understanding of Earth's spheres and how they are connected is difficult.  Review the graphics below to help identify the parts of the Earth System and the processes that connect them at the local, regional, and global scales.

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