Volcano
Characteristics
Quiescent Eruptions
involve fairly calm flows of very fluid basaltic lavas which are often triggered by the arrival of a new batch of molten rock into the near-surface magma chamber.
Explosive Eruptions
have magmas which contain some water vapor and other gases that are kept in solution by the immense pressure of the overlying rock
source of material
Magma
Composition
Dissolved Gases
Temperature
Anatomy
Lava
when magma reaches the surface
Conduit
Vent
Crater
Calderas
Parasitic Cones
Materials Extended during an Eruption
Lava Flows
Gases
Pyroclastic Materials (pyro=fire) (clast=fragment)
Aa Flow
has surfaced of rough, jagged blocks with dangerously sharp edges and spiny projections.
Pahoehoe Flows exhibits smooth surfaces that sometimes resemble twisted braids of ropes.
Pillow Lavas are lava flow composed of numerous the like structures stacked one atop the other.
75% found in
Ring of Fire