Scientists have been tracking seasonal freeze-thaw patterns for 30 years. This map, produced from data*collected by*NASA’s*Soil Moisture Active Passive*satellite,*“shows the freeze-thaw status of areas north of 45 degrees latitude on March 5, 2015, as spring approached. Frozen land is blue; thawed land is pink. The measurement is possible because frozen water forms crystalline structures that can be detected by satellites.”*NASA Earth Observatory.
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