Chapter 3 Test

Cones, Eruptions, and Pyroclasts

Name____________________

1. Name two reasons that volcanic eruptions occur.
   1.  
   2.  
2. Name and draw the three kinds of volcanic cones.
   1.  
   2.  
   3.  
3. What is a hot spot?
4. Fill in the blank with the correct answer. Use the following words to complete the blanks. Dust, Lava Tube, Mantle Plume, Ash, Caldera, Pyroclastic Flow, Blocks.
   1. A large rough edged, angular pyroclast that is ejected during a volcanic eruption is called a _______________________.
   2. A______________________ is a bowl-shaped depression caused by a volcanic eruption in which the top of the volcano collapses.
   3. The smallest of the pyroclasts are called ___________________. They may stay in the atmosphere for years.
   4. A ____________________ forms when the surface of the lava cools and hardens, while the molten interior flows through and drains away.
   5. __________________ is the second smallest pyroclast. This material along with lava builds stratovolcanoes larger with repeated eruptions.
   6. A ____________________ is very hot, solid rock that rises through the mantle and will become magma as it reaches the surface of the Earth. They form hot spots.
   7. A_________________________ is a very hot, twirling mixture of ash, small pieces of pumice and other pyroclasts that are heavier than air and move down a volcano at high rates of speed.