National Earth Science Teachers Association
Windows to the Universe: Graphing the Extent of Sea Ice in Arctic and Antarctic
Students graph sea ice extent in both polar regions over a three-year period to learn about seasonal variations, and over a 30-year period to learn about longer-term trends.
National Earth Science Teachers Association
Windows to the Universe: Changing Planet: Melting Glaciers
Students sort photographs of glaciers and measure glacial retreat to observe how alpine glaciers have retreated over the past century. Includes a printable worksheet, links to relevant materials, and extension activities.