Planet Earth: Topic 6 - Volcanoes
Answers
1. Volcanoes erupt when they become active. Until an eruption occurs, volcanoes are described as ...
x stagnant
dormant
(Text p. 406) When volcanoes are not active, they are dormant.
x extinct
x plugged
2.
There are a number of volcanoes that border the pacific ocean. These volcanoes are known as the
Ring of Fire. The name comes from the fact that these volcanoes erupt with red hot lava, fire and
steam. Most volcanoes in the Ring of fire occur at ...
subduction zones
(Text p. 410) Most volcanoes in the Ring of Fire occur at subduction zones)
x abduction zones
x conduction zones
x compression zones
3. One of the most dangerous side effects of an erupting volcano is a ...
x lava flow
x ash plume
x ash layer
tsunami
(Text p. 406) 32,000 people died when tsunamis were triggered by the eruption of Krakatau
4.
Vesuvius has been a dormant volcano since 1944, but is due for a major eruption. An added
danger, besides the major build-up of magma beneath the peak is the discovery of a rock ...
x bulge
x plume
x vent
plug
(Text p. 407) The opening at the peak is sealed with a rock 'plug'.
5.
Volcanoes can cool temperatures around the world. Despite the hot temperatures and firey
destruction they can create, the lowering of world temperatures can be caused by ...
x a rapid lava flow into the ocean
x an ash plume causing mudflows
