Show:
Vocabulary
Historic Eruptions
Kinds of Volcanoes
Forming Volcanoes & Other Features
How a Volcano Works
100
A volcano is a weak point in Earth's surface where magma from the mantle reaches the crust.
What is a volcano?
100
Krakatau was, in 1883.
Which volcano blast was heard over 5,000 kilometers away?
100
They are cinder-cone, composite, and shield volcanoes.
What are the three types of volcanoes?
100
An island can be created by a colliding boundary.
Could an island be created by a colliding boundary?
100
There is quiet eruptions and explosive ones.
What are the types of volcano eruptions?
200
The Ring of Fire is a belt of volcanoes that rims the Pacific Ocean.
What is the Ring of Fire?
200
Mt. St. Helens did, in 1980.
What volcano blast blew the top of the volcano off?
200
It may create islands of cooled magma.
What is the result of a volcano that is on a hot spot erupting?
200
A caldera is a hole that is formed when a volcano collapses.
What is a caldera?
200
It may blast a lot of material upward, and maybe take some of the volcano with it.
What is the result if an explosive eruption?
300
Lava is magma when it reaches the surface. Magma is underground.
What is the difference between lava and magma?
300
Mount Katmai.
What volcano, in 1912, exploded in Alaska, and now, a river cuts through its ash?
300
It may create an island arc.
What may happen when a colliding boundary creates volcanoes?
300
There is a basin in California in the Central Valley.
Where is there a basin in California?
300
It can cause a explosive eruption instead of a quiet one.
What is the effect of a eruption that has high silica?
400
A dormant volcano could erupt in the future, but extinct volcanoes probably won't.
What is the difference between a dormant and extinct volcano?
400
It was Mt. Pelée.
What is the volcano that erupted in 1902 and killed everyone but two residents of St. Pierre?
400
Some landforms are calderas, volcanic necks, dikes, and sills.
What are some landforms made from magma? (Name 3)
400
Geysers can form in past or present volcanic activity.
Where can geysers form?
400
It goes into the magma chamber first.
Where does magma flow before it goes into the vent and spews out?
500
It may shoot ashes, hot gases, cinders, and "bombs".
What is the 4 things a pyroclastic flow may shoot?
500
It is Mount Etna.
What is the volcano that erupted in 2002 in Sicily?
500
Cinder-cone volcanoes are created in explosive eruptions, when ashes, cinders, gases, and bombs build up around a volcano.Composite volcanoes, however are formed when lava flows alternate with layers of lava and layers of ash.
What is the difference between cinder-cone volcanoes and composite volcanoes?
500
There is fertile soil after an eruption, and it is good for planting.
Why do people like to farm near volcanoes?
500
Pele's hair, pumice, obsidian.
Give an example of a rock that volcanoes can form.