Alaska officials have raised the alert level of a volcano after a growing lava dome appeared in its summit crater.
The Alaska Volcano Observatory said the observation increases the possibility but does not guarantee an eruption at Cleveland Volcano.
The officials said the dome has grown from about 131 feet to 164 feet in diameter since Friday.
Image Caption: This GeoEye IKONOS image shows a faint plume issuing from Cleveland Volcano at 2:31 PM on September 14, 2010. Red in this image highlights areas of vegetation detected by the near-infrared channel. Credit/Copyright: 2010 - GeoEye
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