Textures- lava flows pahoehoe, aa, rock texture, vesicular texture; glassy texture, obsidian, pillow lava; explosive textures, ash, pyroclastic texture, vesicular texture, pumice (vesicular)
Controls on explosiveness: gas content (H20, CO2, N, SO2, H2S), magma viscosity, temperature, SiO2 content
Types of volcanos: shield volcanoes, cinder cones, composite volcanos,
lahars, pyroclastic flows, 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.