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Volcano Exam Study Guide
Volcanoes and Plate Tectonics
1. This is a weak spot in the Earth’s crust that allows magma to come to the surface
_______________________________________
2. Magma is ________________________ ground and has/ does not have dissolved gasses.
3. Lava is ___________________________ ground and has/ does not have dissolved gasses.
4. Earthquakes and a lot of volcanoes are caused by ________________________________.
5. Along the Pacific plate is the _______________________________ which is a belt of volcanoes.
6. Volcanoes can happen at _____________________ boundaries (ex: mid-ocean ridge and Iceland).
7. Volcanoes can also happen at convergent boundaries which can be either
__________________________________ which creates volcanoes along the edge of a continent, or
____________________________ which creates island arcs like the Philippine Islands.
8. Volcanic islands like the Hawaii on the other hand, are created by ___________________ which do
not move, instead the ____________________________ move with the crust.
9. Use the diagram on the previous page to answer the following questions:
a. Which island is the oldest? _________________
b. Which island is the youngest? __________________
c. Which islands are made out of extinct volcanoes? __________________
d. Which island volcanoes are still active?__________________
e. Which islands still has the hotspot under it?____________________
Volcanoes
1. Why does magma want to/ is able to rise above the crust? ____________________________________
2. Fill in the diagram of the volcano:
3. Magma moves through the volcanoes ______________________ from the magma chamber
4. Lava first loses its dissolved gasses when it reaches the _________________ and collects at the
__________________ until it overflows.
5. Some volcanoes have __________________________ which allows lava to come out through the
side.
6. There are three stages of a volcanoes “life”: _____________________, _____________________,
and ______________________________.
7. _____________________________ volcanoes may erupt in the near future or erupted recently.
8. _____________________________ volcanoes are “sleeping” because they may erupt in the future and
still have magma in their magma chamber.
9. __________________________ volcanoes are never going to erupt again because their magma
chambers are empty.
10. ___________________ volcanoes are gentle sloping and made out of lava. These volcanoes have
_______________________ eruptions and have side vents.
11. _______________________________ volcanoes are steep and cone shaped, and are made up of ash,
cinders, and bombs around the crater. This type of volcano has ______________________ eruptions and
no side vents.
12. The last type of volcano also coned shape but is made up of alternating layers of cinders, ashes, and
bombs. This type of volcano can also have side vents and has quiet eruptions. This type of volcano is
the _______________________________ volcano.
13. Ashes are volcanic rocks that are ________________________ sized.
Cinders are volcanic rocks that are ____________________________ sized.
Bombs are volcanic rocks that are ____________________________ sized.
14. _______________________,_____________________, and ________________ are examples of
volcanic rocks.
15. Draw how a shield, cinder cone, and composite volcano look from the side.