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For the past eight years, scientists have been working to make sense of why some satellite data seemed to show the Amazon rain forest "greening-up" during the region's dry season each year from June to October. The green-up indicated productive, thriving vegetation in spite of limited rainfall.
For more than a decade, instruments on Terra and Aqua, two of NASA’s flagship Earth-observing satellites, have scanned the surface of our planet for fires four times a day.
- To swell, as grain or wood with water.