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