When referred to as a gas, it means a volatile has transitioned into the vapor phase. The most common gases (or vapor phase volatiles) emitted at the surface are water (H2O), carbon dioxide (CO2), and ...

A brutal Arctic blast has turned parts of the Eastern United States into a deep freeze, and along at least one frozen shoreline the cold has sculpted something that looks straight out of science ...

When magma moves into the rift zone of a Hawaiian volcano, there is understandably a lot of excitement and apprehension. How far will the magma go, and will it erupt? But even long after the activity ...

The production of maps to track the progress of ongoing eruptions has long been part of the USGS Hawaiian Volcano Observatory mission to inform the public about volcanic hazards in Hawaii. The methods ...

This map shows the tephra fall associated with episode 41 of Kilauea's episodic summit eruption, on Jan. 24. Tephra is a generic word for any material erupted by a volcano that travels through the air ...

The recent earthquake swarm near Santorini has brought the topic of volcanoes in Greece back into the spotlight.

Add Yahoo as a preferred source to see more of our stories on Google. When you think of the United States, images of sprawling cities and vast landscapes might come to mind, but not the hidden and ...