USGS Landsat 8 image showing algal bloom in Lake Erie - September 2017
By Earth Resources Observation and Science (EROS) Center
September 2017 (approx.)

Detailed Description
USGS Landsat 8 image showing algal bloom in Lake Erie in September of 2017. Landsat’s spectral bands allow researchers to see photosynthetic activity that is invisible to the naked eye.
Sources/Usage
Public Domain.