Volcanism. Any activity that includes the movement of magma towards or onto Earth’s surface. http://dsc.discovery.com/tv-shows/discovery-presents/videos/understanding-volcanoes-lava-flow.htm. Volcano:. A vent or fissure in Earth’s surface through which magma and gases are expelled.
Any activity that includes the movement of magma towards or onto Earth’s surface
A vent or fissure in Earth’s surface through which magma and gases are expelled
Volcanoes are formed by:
An area around the Pacific Ocean characterized by volcanoes and seismic activity
Magma that flows onto the Earth’s surface
Liquid rock produced under the Earth’s surface
This lava flow is smooth, fluid, and “runny” – What type is it…MAFIC or FELSIC?
Just to put the size of the Mount Saint Helens eruption in perspective, this figure compares the size of that eruption (as measured by the volume of ejected material) to some bigger ones in the past. Notice how small Mt. St. Helens was compared to the others!!