NAME _________________________________________________________________________ PERIOD
UNIT 4 LESSON 4 VOLCANOES STUDY GUIDE (3085)
1. Know the difference between magma and lava. Using the following word bank for questions 2 – 8
subduction
Ring of Fire
Hawaiian islands
tectonic plate
hot spot
vent
magma chamber
crater
2. The _____________________________________________________________ surrounds the Pacific plate and is where
lots of volcanoes occur.
3. A _______________________________________________________________ volcano forms in the middle of plates
above a magma chamber. An example of this type of volcano are the
__________________________________________________________________________.
4. Most volcanoes form along ______________________________________________________________ boundaries.
5. Volcanoes that form along convergent boundaries may form from ____________________________________.
6. The pocket beneath a volcano where molten rock collects is the ______________________________________.
7. a bowl-shaped area that forms around a volcano’s vent is called a ____________________________________.
8. The opening through which molten rock and gas leave a volcano is called the
____________________________________________________
Using the word bank below answer questions 9- 15
aa
Pahoehoe
dormant
extinct
pyroclastic flow
silica
active
9. What is the expulsion of ash, cinder, bombs and gases called? _________________________________________
10. The stage of a volcano that means it is unlikely to erupt again is called what?
______________________________________________________________
11. A cooler, slower moving type of lava that hardens into rough, sharp chunks of rocks is called what?
_____________________________________________________
12. A stage of a volcano that is erupting or has shown signs of erupting in the near future is called what?
_____________________________________________________
13. A material found in magma that absorbs moisture and make s the lava thicker is called what?
_____________________________________________________
14. A hot, faster moving type of lave that hardens to form smooth, ropelike coils is called what?
_____________________________________________________
15. The stage of a volcano that means it does not show signs of erupting in the near future (The volcano is
sleeping.) ___________________________________________________________
16. Why does magma flow upward? Because the magma is __________________________ dense than the
surrounding rock
17. Circle all the factors that determine how magma flows.
Gases
silica
Size of crater
color
temperature
diameter of vent
number of vents in the volcano
18. The amount of ________________________________________________________ in the magma will determine how
a volcano will erupt; quietly or explosively.
19. A quiet/explosive (circle one) volcano produces a pyroclastic flow.
20. What volcanic hazard is made up of rocky particles that range from the size of a baseball and a car?
dust
ash
cinder
bomb
lava
(circle one)
bomb
lava
(circle one)
21. The main hazard of a quiet volcano is
dust
ash
cinder
Use the following word bank to answer questions 22 –27
Cinder volcano
shield volcano
East coast
lava plateau
composite volcano
caldera
west coast
22. A tall, cone shaped mountain in which layers of lava alternate with layer of ash and other volcanic
materials is called a ______________________________________________________.
23. A wide, gently sloping mountain made of layers of lava and formed by quiet eruptions is call a
___________________________________________________.
24. The large hole at the top of a volcano formed when the roof of a volcano’s magma chamber collapses is
called a _______________________________________________________________.
25. A steep, cone-shaped hill or mountain made of volcanic ash, cinders and bombs piled up around a
volcano’s opening is called a _______________________________________________________.
26. What is a high, level area made of many layers of thin, runny lava called? ________________________________
27. What part of the United States would be more likely to have volcanic activity?
__________________________________________________________________________
Why?