Why are there volcanoes? Why do they erupt? | Volcano.
Volcano Sushi Bar & Hibachi
Hotspots are volcanic areas believed to be formed by mantle plumes , which are hypothesized to be columns of hot material rising from the core-mantle boundary in a fixed space that causes large-volume melting. Because tectonic plates move across them, each volcano becomes dormant and is eventually re-formed as the plate advances over the postulated plume. The Hawaiian Islands are said to have been formed in such a manner; so has the Snake River Plain , with the Yellowstone Caldera being the part of the North American plate above the hot spot. This theory, however, has been doubted. 
The current activity is based along the east rift zone. According to the US Geological Survey , 23 separate new fractures there became volcanic fissures from which lava erupted. By the end of May, “fissure 8” (the eighth new fissure to have announced itself) had become dominant – with activity at the others ceasing or subsiding. This was the source of the lava that by June 4 was flowing into the sea several miles away near the Vacationland resort, where it completely filled what had previously been Kapoho Bay .
"These signs may include very small earthquakes beneath the volcano, slight inflation, or swelling, of the volcano and increased emission of heat and gas from vents on the volcano," said . Geological Survey (USGS) Volcano Hazards Program coordinator John Eichelberger.
Feature photo: Image from . Eruption of Mount St Helens, WA in 1980 – read more about it here The terrain surrounding Vancouver draws ...
The Volcano Theater Company was founded in 1854. The company conducts a full season each year, performing in both the 35-seat Cobblestone Theater and in the larger outdoor Volcano Amphitheater.
Monday to Thursday 4:30 pm - 10 pm
Friday 4:30 pm - 10:30 pm
Saturday 12 noon - 10:30 pm
Sunday 12 noon - 10 pm