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Hazards
100
a land or underwater feature that forms when magma reaches the surface of the earth
What is a volcano?
100
a central, circular or oval shaped land form on a volcano
What is a vent?
100
This type of volcano - huge, gently sloping, quiet eruptions, basaltic magma
What is a shield volcano?
100
a rounded volcanic feature that forms when a mass of highly viscous lava slowly erupts.
What is a lava dome?
100
fine grained tephra
What is volcanic ash?
200
molten, liquid rock material found underground that forms igneous rocks.
What is magma?
200
Landform which occurs when a oceanic plate subducts under a continental plate
What is a volcanic arc?
200
type of volcano with steep slopes, violent explosive eruptions with layers of tephra and basaltic lava.
What is a cinder cone?
200
This feature occurs when magma chamber's outer surface cools, hardens and empties.
What is a lava tube?
200
a rapidly flowing mixture of volcanic debris and water.
What is a lahar?
300
Name three places volcanoes tend to form.
What are convergent and divergent plate boundaries and hot spots?
300
Type of eruption which occurs when magma escapes form a narrow and elongated crack in the earth's crust.
What is a fissure eruption?
300
Type of volcano which is tall and has alternating layers of lava and tephra. Both explosive and quiet eruptions
What is a composite volcano?
300
the largest intrusive igneous feature that forms when magma slowly cools and solidifies before reaching the surface.
What is a batholith?
300
a fast moving body of hot gases and solids.
What is a pyroclastic flow?
400
this geologic feature forms when 2 ocean plates converge.
What is an island arc?
400
Type of geologic feature that created the Hawaiian Islands
What is a hot spot?
400
this type of lava occurs where lava oozes out of fissure eruptions on the ocean floor.
What is pillow lava?
400
landforms that occur when magma squeezes into cracks below the surface and cuts across rock layers and hardens.
What is a dike?
400
2 gases that are released from volcanoes that can mix with water and form acidic precipitation?
What are sulfur dioxide and hydrogen sulfide?
500
localized areas of high heat within earth's interior.
What are Hot spots?
500
Type of geologic feature that created the Cascadia mountain range.
What is a volcanic arc?
500
the 2 lithospheric plates that created the volcanic arc of the Cascadia Mountain range.
What are the North American and Juan de Fuca Plates?
500
magma that squeezes into rocks below the surface and is parallel to rock layers and hardens.
What are sills?
500
Four signs that may occur before volcanic activity
What are small earthquakes, gas emissions, ground movement and ground temperature changes