Alaska’s Mount Redoubt remained active on April 7, 2009, releasing a plume that blew across the Cook Inlet toward the southeast. The Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Aqua satellite took this picture the same day. The volcanic plume’s light color in this image suggests that the volcanic emissions consist primarily of water vapor. Earlier emissions had coated the snowy ground with muddy-brown volcanic ash, and some traces of that ash linger northeast of the volcano. The current plume casts a shadow toward the northeast, over the land and the water.
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