Nasa visible earth.

An image collection of Earth science-related visualizations and images, collected from numerous NASA projects. Provides a consistently updated, searchable, central point of access to the superset of NASA's Earth science-related images, animations, and data visualizations. The images relate to the biosphere, agriculture, atmosphere, hydrosphere, oceans, land surface, radiance, cryosphere, and other topics. http://visibleearth.nasa.gov/

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Composite image showing the global distribution of photosynthesis, including both oceanic phytoplankton and vegetation (Photo credit: Wikipedia)