Volcano Assessment Noel Pd 2
- 1.Today, people are never likely to be killed by a volcano.
- A.
True
- B.
False
- 2.Volcanoes can form on the ocean floor.
- A.
True
- B.
False
- 3.There is no relationship between plate tectonics and volcanoes.
- A.
True
- B.
False
- 4.Gas trapped in magma under high pressure can cause explosive eruptions.
- A.
True
- B.
False
- 5.Cinder cone volcanoes produce quiet eruptions.
- A.
True
- B.
False
- 6.A batholith is created when _______________
- A.
Lava forms a thick sheet
- B.
Lava fills a vent
- C.
Magma cools and solidifies underground before reaching the surface
- D.
Magma in a sill pushes up to form a rock dome
- 7.A __________ is an opening in Earth that erupts gases, ash, and lava.
- A.
Caldera
- B.
Volcano
- C.
Dike
- D.
Batholith
- 8.Kilauea in Hawaii is the world's most _________ volcano.
- A.
Dormant
- B.
Active
- C.
Explosive
- D.
All the possibilities
- 9.One factor that determines whether a volcanic erupton will be quiet or explosive is _________________.
- A.
The number of cinder cones
- B.
The height of the volcano's neck
- C.
The amount of water vapor and other trapped gases in the magma
- D.
The amount of tephra in the magma
- 10.Devil's Tower in Wyoming is an example of a ____________________.
- A.
Caldera
- B.
Volcanic neck
- C.
Dike
- D.
Batholith
- 11.In 1990, lava from ______________ covered most of a town in Hawaii.
- A.
Kilauea
- B.
Mount Pelee
- C.
Mount St. Helens
- D.
Mount Pinatubo
- 12.More than _______________ of Earth's volcanoes are currently active.
- A.
100
- B.
1500
- C.
600
- 13.Magma forms deep inside Earth because of _________________.
- A.
A rise in temperature and a drop in pressure
- B.
A drop in temperature and a rise in pressure
- C.
A rise in temperature and increase in pressure
- D.
A drop in temperature and a drop in pressure
- 14.Some volcanoes form islands as __________ flows from the rifts in the seafloor and builds up high enough to break the ocean's surface.
- A.
Lava
- B.
Tephra
- C.
Water
- D.
Gas
- 15.Magma that squeezes into a horizontal crack between rock layers and hardens is called a __________
- A.
Dike
- B.
Batholith
- C.
Sill
- D.
Volcanic neck
- 16.Magma that is squeezed into a crack that cuts across rock layers vertically and hardens is called a ___________.
- A.
Dike
- B.
Batholith
- C.
Sill
- D.
Volcanic neck
- 17.If, after an eruption, the top of a volcano collapses down, a __________ forms.
- A.
Caldera
- B.
Vent
- C.
Crater
- D.
Volcanic neck
- 18.Differences in _______________ cause a volcanic neck to form.
- A.
Eruptive forces
- B.
Water content
- C.
Resistance to erosion
- D.
Silica content
- 19.Most of the rock in Yosemite National Park is an exposed _________________.
- A.
Dike
- B.
Sill
- C.
Batholith
- D.
Volcanic neck
- 20.Basaltic magma produces nonexplosive eruptions such as those at ___________________.
- A.
Mount St. Helens
- B.
Mount Pinatubo
- C.
Kilauea
- D.
Paracutin
- 21.A steep walled depression around a volcano's vent is called a _______________.
- A.
Caldera
- B.
Crater
- C.
Volcanic neck
- D.
Dike
- 22.Parcutin, in Mexico, is a __________________ volcano.
- A.
Composite
- B.
Shield
- C.
Cinder cone
- D.
Hot spot
- 23.Soufriere Hills volcano, in Montserrat, is a ______________ volcano.
- A.
Shield
- B.
Cinder cone
- C.
Hot spot
- D.
Composite
- 24.Silica rich magma______________
- A.
Can form at subduction zones
- B.
Produces explosive eruptions
- C.
Is thick and gas gets trapped, causing pressure to build up
- D.
All the possibilities
- 25.____________ magma is silica poor and causes quiet, nonexplosive eruptions.
- A.
Basaltic
- B.
Andesitic
- C.
Granitic
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