Volcanoes

Textures- lava, pahoehoe, aa, vesicular texture; cinders/scoria, obsidian, pillow lava; explosive, ash, pyroclastic, vesicular texture, pumice 

Controls on explosiveness: gas content (H₂0, CO₂, N, SO₂, H₂S), magma viscosity, temperature, SiO₂ content

Types of volcanos: shield volcanos, cinder cones, composite volcanos, lahars/pyroclastic flows, fissure eruptions, calderas

Compare and contrast shield volcanoes, cinder cones, and composite volcanoes. Give one example of where each type can be located.

Describe four textures associated with volcanic rocks, and explain how each texture forms.