In late 2004,A slumbering giant began to stir.for the first time in 1986,Mount St. Helens In Washington state,Rumbled back to life.The most infamous volcano in the united states shook with small earthquakes as a lava dome grew in its crater and great bursts of steam shot skyward.
Mauna Loa is one of the massive and biggest volcanoes ever. it towers 13,677 feet (4,169 meters) above sea level. to sea floor,measured 30,000 feet (9,144 meters tall
where volcanoes erupt and why
Most live near the pacific, nearly half of the western pacific alone. The "ring of fire"-a necklace of volcanoes that rims the Pacific Ocean.
volcanoes vary greatly in activity.As a rule,periods of partial or complete inactivity alternate with periods of explosive violence.