Introduction to Volcanoes http earthref orgSCC Scripps Classroom

Introduction to Volcanoes http: //earthref. org/SCC Scripps Classroom Connection

Shield Volcano §Like a soldier’s shield on the ground §Wide base, shallow sides §Produces fast-flowing lava §Not explosive (mostly) !! Shield Volcano http: //earthref. org/SCC Scripps Classroom Connection

Shield Volcano §Layers of cooled lava §Eruptions can occur at summit and side vents §Largest volcanoes on Earth -Mauna Loa, Hawaii: 300 km wide at it’s base (on the sea floor) Structure of a shield volcano http: //earthref. org/SCC Scripps Classroom Connection

http: //www. youtube. com/watch? v=5 h. E 2 DZdl 0 IA Lava from Kilauea, Hawaii Eruption http: //earthref. org/SCC Scripps Classroom Connection

http: //www. youtube. com/user/Actualidad. RT? v=n 61 b. HSCyg. S E&feature=pyv&ad=7259836166&kw=volcanos Aerial footage of Kilauea Eruption http: //earthref. org/SCC Scripps Classroom Connection

Stratovolcano §Classic volcano look §Gentle slopes at bottom, steep slopes at top §Alternating layers of lava and rock fragments (pyroclastics) §Explosive!!!! Stratovolcano http: //earthref. org/SCC Scripps Classroom Connection

Stratovolcano structure http: //earthref. org/SCC Scripps Classroom Connection

Pyroclastic flows contain a mix of ash and rock fragments Pyroclastic Flow http: //earthref. org/SCC Scripps Classroom Connection

Cinder Cones Symmetrical, tall cones Steep sides Made of shattered bits of lava Highly explosive Cinder Cones http: //earthref. org/SCC Scripps Classroom Connection

Conclusions ● Three volcano types 1. Shield Volcano -Layers of lava flows, non-explosive 2. Stratovolcano -Alternating lava and pyroclastic layers, explosive 3. Cinder Cones - Ash and fragmented lava, explosive http: //earthref. org/SCC Scripps Classroom Connection