Lava is magma that flows out onto Earth's surface.
100
What are the three types of volcanoes?
The 3 types of volcanoes are: Shield, Stratovolcanoes (or Composite), and Calderas
100
What is a Volcano?
Any location where lava is erupted at the Earth's surface.
100
Where do most volcanic eruptions occur?
Along the boundaries between shifting tectonic plates.
100
What are active volcanoes?
Active volcanoes are the volcanoes that erupt constantly.
200
What is magma?
Magma is melted rock below the Earth's surface.
200
What is a shield volcano?
A type of volcano typically associated with sloped sides and quiet & gentle eruptions.
200
This type of tectonic boundary is usually associated with midocean ridges; however, the typical eruption happens underwater and is not seen....?
Divergent boundary
200
Why does the rock in the mantle melt?
As the tectonic plate moves under another (subduction zone), the rock in the mantle melts and becomes magma.
200
What are dormant volcanoes?
These volcanoes have become inactive, but people are not certain that they will not erupt again.
300
what is a vent?
Openings through which volcanic materials erupt are called vents.
300
What is a stratovolcano?
This type of volcano is associated with violent and powerful eruptions with steeply sloped sides.
300
What is a hot spot?
A region of volcanic activity in the middle of a tectonic plate.
300
Why does magma rise?
magma, the melted mantle, rises because it is filled with gas and is less dense than the solid rock around it.
300
What is an explosive eruption?
A violent explosion of lava.
400
Are volcanoes found above sea-level or below?
BOTH, ya big dummy
400
What is a Caldera volcano?
Calderas form via past eruptions and creates a bowl-like depression through which lava is erupted
400
This type of boundary is usually found above water, and is associated with violent and explosive eruptions (like Mt. St. Helens)....?
Subduction Zone
400
Effusive Eruption: casually flows out of the ground? or violently explodes?
casually flows out of the ground...business casual
400
What are Extinct Volcanoes?
Volcanoes that have not erupted in recorded history are considered to be extinct volcanoes. Kinda like the dinosaurs.
500
Define Subduction Zone. Where is it located?
subduction occurs when two plates collide. the denser; heavier, palte slides under the other plate and becomes part of the mantle.
500
Which type of volcanic landform is the most destructive? Name a volcanic landform that was developed this way.
Composite volcano.
Mt. St. Helens is a composite volcano.
500
True or False: Hot spots location depend entirely on plate boundary activity.
obviously false...ya dummy
500
How do hot spots form new land? Name a landform created by hot spots.
Hot spots erupt and release magma. As magma comes out it becomes lava and hardens into landforms.
Hawaiian islands are created by hot spots.
500
How do the types of volcanic eruptions differ?
Active: erupt constantly
Intermittent: erupt at fairly frequent intervals
Dormant: have become inactive but might erupt in future
Extinct: have not erupted within recorded history