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Chapter 3 Test
Cones, Eruptions, and Pyroclasts
|1. ___Lava||A. Rough and fragmented lava flows|
|2. ___Pahoehoe||B. The most explosive eruption type. Ash plumes may reach 50,000 feet.|
|3. ___Plinian||C. Molten rock on the surface of the Earth|
|4. ___Hawaiian||D. Large pyroclasts-over 2 inches long with a rounded shape|
|5. ___Aa||E. Smooth and ropey lava flows|
|6. ___Low Viscosity||F. Thin and runny magma that usually erupts quietly with large amounts of lava.|
|7. ___Bombs||G. Eruption type in which thin and runny magma reaches the surface of the Earth through the main vent and fissures.|
8-9. Name two reasons that volcanic eruptions occur.
10-15. Name and draw the three kinds of volcanic cones.
16. What is a hot spot?
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.
17. A large rough edged, angular pyroclast that is ejected during a volcanic eruption is called a _______________________.
18. A______________________ is a bowl-shaped depression caused by a volcanic eruption in which the top of the volcano collapses.
19. The smallest of the pyroclasts are called ___________________. They may stay in the atmosphere for years.
20. A ____________________ forms when the surface of the lava cools and hardens, while the molten interior flows through and drains away.
21. __________________ is the second smallest pyroclast. This material along with lava builds stratovolcanoes larger with repeated eruptions.
22. 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.
23. 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.