Introduction to Volcanoes Scripps Classroom Connection.

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Presentation transcript:

Introduction to Volcanoes Scripps Classroom Connection

Shield Volcano  Like a soldier’s shield on the ground  Wide base, shallow sides  Produces fast-flowing lava  Not explosive (mostly) !! Scripps Classroom Connection

Structure of a shield volcano 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) Scripps Classroom Connection

Lava from Kilauea, Hawaii Eruption Scripps Classroom Connection

Aerial footage of Kilauea Eruption Scripps Classroom Connection E&feature=pyv&ad= &kw=volcanos

Stratovolcano  Classic volcano look  Gentle slopes at bottom, steep slopes at top  Alternating layers of lava and rock fragments (pyroclastics)  Explosive!!!! Scripps Classroom Connection

Stratovolcano structure Scripps Classroom Connection

Pyroclastic Flow ● Pyroclastic flows contain a mix of ash and rock fragments Scripps Classroom Connection Pyroclastic Flows

Cinder Cones Symmetrical, tall cones Steep sides Made of shattered bits of lava Highly explosive Scripps Classroom Connection

● 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 Scripps Classroom Connection Conclusions