Measurements of ground water—rather than water on the surface—reveal the long-term effects of drought. These maps show ground water conditions in the U.S. compared to the long-term average from August 2002 to August 2012. Map by Chris Poulsen, National Drought Mitigation Center, based on data from the GRACE science team.


 
Map by Chris Poulsen, National Drought Mitigation Center, based on data from the GRACE science team.
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Alex E

Ecoclimax is defined by Odum (1969) as the culmination state after a succession in a stabilized ecosystem in which maximum biomass (or high information content) and symbiotic function among organisms is kept per unit of available energy flow.