Name ______Date ______Per. _____

Volcano Review WS

  1. What happened? Match the description to each volcano eruption.
  2. Crater Lake occurred after explosion____Mt. Vesuvius
  3. Sudden death by pyroclastic flow____ Kratatoa
  4. Renewed volcanic activity in 1980____ Mt.Mazama
  5. Buried Pompeii____ Mt. St. Helens
  6. Heard ‘round the world____ Mt.Pelee
  1. What is it? Match the description to each pyroclastic object.
  2. Pumice____ shiny volcanic glass
  3. Phenocryst____ Full of holes, like swiss cheese
  4. Obsidian____ Spindle or lens-shaped
  5. Bomb____ Hardened, frothy volcanic glass
  6. Vesicular basalt____ Large crystal in porphyritic rock
  1. True or False.
  2. ____ Geologists believe that Honolulu will be devastated by pyroclastic flows.
  3. ____ Cinder cones are usually steeper than stratovolcanoes.
  4. ____ Pillow structure is regarded as an indication of submarine eruptions.
  5. ____ Volcanic gas released during eruptions is mainly steam.
  6. ____ Pieces of pumice that can float are believed to contain pulverized wood ash.
  7. ____ Lava fountains create cinder cones.
  8. ____ Volcanic rocks that have a high silicate content are generally light colored.
  9. ____ The viscosity of lava determines how easily it can flow and release gas.
  10. ____ Most extrusive igneous rocks are fine-grained.
  11. ____ The most abundant felsic extrusive rock is andesite.
  12. ____ Obsidian is noncrystalline
  1. Volcano Profiles. Match the letters of the sketches below with the appropriate choices. Use choices more than once.

A B

CD

____ stratovolcano____ generally steepest

____ cinder cone____ mostly felsic lava

____ shield volcano____ mostly mafic lava

____ volcanic (lava) dome____ mostly intermediate lava

____ mostly convex slopes____ most likely explosive eruptions

____ mostly concave slopes____ mainly low-viscosity lavas

____ built mostly of pyroclasts____ mainly andesitic rocks

____ made of lava & pyroclasts____ mostly basaltic rock

____ smallest volcano type____ mostly rhyolitic rock

____ largest (widest) volcano____ tallest volcano

  1. Label the features in the diagram. Use each label only once.

  • Ash/gas cloud
  • Ash layer
  • Stratovolcano
  • Crater
  • Feeder conduit
  • Flank eruption
  • Lava layer
  • Magma chamber
  • Subsidiary cone
  • Vent
  • Crust

Type of Volcano:______

  1. Multiple Choice. Choose the best answer.
  2. ____Which of the following minerals (except in minor amounts) would NOT be associated with a very explosive volcano?

  1. Feldspar
  2. Quartz
  3. Olivine
  4. Muscovite

  1. ____Which of the following phrases in NOT likely to be used in describing volcanoes?
  2. Very small to very large in size
  3. May be conical shaped
  4. Built up over preexisting rocks
  5. Made of mainly dense-textured rocks
  6. Composed of intrusive rocks
  1. Describe each of the following terms:
  2. Volcanic ash/tuff -
  3. Volcanic bombs -
  4. Tephra -
  5. Lahar -
  6. Lapilli-
  7. AA -
  8. Pahoehoe -