Lava is magma that flows out onto Earth's surface.
100
What three kinds of volcanoes?
There are 3 types of volcanic landforms: Cindercone, Shield, and Composite
100
What is Magma?
Molten rock beneath the earth's surface.
100
Where do most volcanoes occur?
Most volcanoes, like most earthquakes, occur along the boundaries between shifting tectonic plates.
100
What are active volcanoes?
Active volcanoes are the volcanoes that erupt constantly.
200
What are magma chambers?
Magma chambers are reservoirs from which volcanic materials erupt.
200
What is a cinder cone volcano?
This type of volcanic landform is made up of small rock particles, or cinders. It is characterized by a small cone with steep sides.
200
What is a volcanic neck?
A landform that forms when magma hardens in a volcano's pipe and the surrounding rock later wears away.
200
What provides the force that causes magma to erupt to the surface?
Dissolved gases trapped in 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? Where is it located?
Openings through which volcanic materials erupt are called vents. They are located near the peak of the mountain.
300
What is a shield volcano?
This type of volcano is made up of layers of lava rocks. it's not as steep as cinder cone volcano and is created slowly that's why it has gentle and broad sides.
300
What is a hot spot?
An area where material from deep within Earth's mantle rises through the crust and melts to form magma.
300
What are diverging plate boundaries.
Volcanoes that form along a mid-ocean ridge occur at diverging plate boundaries, where 2 plates move apart.
300
What are extinct volcanoes?
A dead volcano that is unlikely to ever erupt again. For example hot spot volcanoes may become extinct after they drift away from the hot spot.
400
What are craters?
Craters are bowl-shaped depressions. Forceful explosions may blow out the tops of mountains to form craters.
400
What is a composite volcano?
This type of volcanic landform is made up of layers of lava flows alternating with layers of ash, cinders, and rocks. It is an explosive volcano
400
What is a batholith?
A mass of rock formed when a large body of magma cools inside the crust.
400
The mixture of hot gases, ash, cinders and bombs that flow down the sides of a volcano when it erupts explosively.
What is pyroclastic flow?
400
What are the 2 types of volcanic eruptions?
Geologists classify volcanic eruptions as quiet or explosive.
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 an example of a volcano that was developed this way.
Composite volcano.
Mt. St. Helens is a composite volcano.
500
What is Ring of Fire and where is it located?
A zone of frequent earthquakes and volcanic eruptions that encircles the Pacific Basin.
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 lava differ in quiet and explosive eruptions?
Quiet eruptions produce hot, low-silica magma that is thin and runny and flows easily.
Explosive eruptions produce high-silica magma that is thick and sticky.