Vocab Flashcards
explosive eruption
a violent eruption caused by pressure build up due to cooler lava + high amounts of gases in the lava
convergent boundary volcano
Forms when two tectonic plates converge and one subducts, melts, and rises through the crust above it.
divergent boundary volcano
Forms at a divergent boundary when two plates pull apart. Magma rises to fill the gap
divergent boundary volcano
Forms at a divergent boundary when two plates pull apart. Magma rises to fill the gap
pyroclastic flow
a dense, destructive mass of hot ash, lava fragments, and gases ejected explosively from a volcano
hotspot
A weak spot in the middle of a tectonic plate where magma surfaces; forms a volcano
viscosity
A substances resistance to flowing
caldera
a large crater caused by the violent explosion of a volcano that collapses into a depression
basaltic magma
low viscosity and low silica eruption is non-explosive
granitic magma
high in silica, light-colored, high viscosity, & explodes as ash/rock
Volcano
A weak spot in the crust where magma has come to the surface
Shield volcano
a wide, gently sloping mountain made of layers of lava and formed by quiet eruptions
Tephra
rock fragments and particles ejected by a volcanic eruption.
Cinder cone volcano
A small, steeply sloped volcano, forms from sort of explosive eruptions
Composite Volcano
A tall, cone-shaped mountain in which layers of volcanic materials
