Volcanoes

Shield Volcanoes

Stratovolcanoes

Cinder Cones

Shield Volcanoes (e.g. Mauna Loa)

Huge structures, in both volume and height Built of very fluid basaltic lavas --> gently sloping sides

Hawaiian lava flows

Pahoehoe flows - smooth, ropy surface

Aa flows - rough, jagged surface

Stratovolcanoes (e.g. Mt. Shasta)

Large volcanoes, particularly in height Built of more viscous lava flows and pyroclastic

debris --> steeper slopes

South Sister, Oregon Cascades

Lava Bomb - South Sister, Oregon Cascades

Mount Rainier, Washington

Cinder Cones (e.g. Wizard Island)

Relatively small volcanoes Built primarily of pyroclastic debris --> steepest

slopes (at angle of repose)

Schonchin Butte, Lava Beds National Monument, CA