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Volcanoes
Disasters: Volcanoes
25
Geology
4th Grade
01/30/2013

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Cards

Term
What was the worse volcanic eruption in US history?
Definition

Mt. St. Helens. It destroyed 200 square miles of forest and killed over 60 people.

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Term
Volcanologist
Definition
A scientist that studies volcanoes.
Term
The volcanologist that was killed while studying Mt. St. Helens?
Definition
David Johnston
Term
Volcano
Definition
opening and mountain of rock in the earth from which lava, gas, rock and ash erupt.
Term
How many active volcanoes are there?
Definition
Over 500
Term
3 Types of volcanos:
Definition
1. Active
2. Dormant
3. Extinct
Term
How do volcanoes form?
Definition
Heat and pressure in the Earth pushes plates together.
Term
What are the 3 parts of the volcano?
Definition

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1. Volcanic form 2. Chimney 3. Magma reservoir

Term
Where is volcanic and earthquake activity the greatest?
Definition
Along the edges of rock plates.
Term
Where are the most volcanoes?
Definition
Along the ridge of the Pacific Ocean
Term
Volcanoes formed 2 sets of islands. Name them.
Definition
1. Hawaiian 2. Aleutian
Term
All volcanoes release _____and _____ but not all produce _______.
Definition
Steam and gas, lava
Term
Volcanic ash can make what good product?
Definition
Fertilizer
Term
Krakatoa killed how many people?
Definition

40,000 people in Indonesia

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Term
Ash
Definition
tiny particles of volcanic rock that are released during an eruption
Term
Chimney
Definition
Tube in a volcano by which lava travels upward and to the surface
Term
Crater
Definition
Bowl shaped hole in the earth or at the volcanoes opening
Term
Disaster
Definition
Event which causes a great amount of damage from property and lives
Term
Dormant
Definition
Volcano that isn't erupting but can erupt again
Term
Eruption
Definition
Powerful release of ash, dust, gas and steam from an active volcano
Term
Extinct
Definition
No longer existing or active
Term
Lava
Definition
Melted rock that comes out of a volcano and later hardens
Term
Magma
Definition
Melted rock within the earth
Term
Seismograph
Definition
Instrument used to record the direction strength and duration of an earthquake
Term
Which volcano eruption caused the year without summer?
Definition
Mount Tambora in Indonesia
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