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Let’s Review!

Let’s Review!. Shield Volcano Broad, gently sloping sides Nearly circular base Form because of layered basaltic lava accumulation during nonexplosive eruptions (basaltic lava: low viscosity small amounts of gases and silica) “Oozing” eruptions. Let’s Review!. Cinder Volcano

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Let’s Review!

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  1. Let’s Review! • Shield Volcano • Broad, gently sloping sides • Nearly circular base • Form because of layered basaltic lava accumulation during nonexplosive eruptions • (basaltic lava: low viscosity small amounts of gases and silica) • “Oozing” eruptions

  2. Let’s Review! • Cinder Volcano • Small; most are less than 500 m high • Formed by material ejected by a vent that falls back to Earth and accumulates around the vent • Steep sides • Its more viscous magma contains more water and silica than that of the magma fueling shield volcanoes • Contains large volumes of gases • More explosive than shield

  3. Let’s Review! • Composite Volcano • Formed when layering alternates between volcanic fragments and lava • Magma contains large amounts of silica, water, and gases • Much larger than cinder-cone volcanoes because of their violent eruptions • Very dangerous to humans and environment

  4. Name that Volcano!! 1.) Shield 2.) Cinder 3.) Composite

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