Lava erupts through this opening in the earths crust.
What is a vent?
100
Rock fragments thrown into the air during a volcanic eruption.
What is tephra?
200
When rock has water incorporated how it affects the melting point.
What is lowers the melting point.
200
The term used to describe something that flows easily.
What is low viscosity?
200
Large Plutons.
What batholiths?
200
A bowl shaped depression at the top of a volcano?
What is a crater?
200
Rapidly moving volcanic material that can travel at speeds of up to 200 km/hr and may contain hot poisonous gases.
What is a pyroclastic flow?
300
How the melting of rock is affected by pressure..
What is it increases the melting point?
300
The type of magma that formed the Hawaiian Islands.
What is basaltic?
300
Irregularly shaped plutons smaller in size than batholiths.
What are stocks?
300
A volcanic crater that is larger than 1 km in diameter.
What is caldera?
300
Where most volcanoes occur.
What is at plate boundaries?
400
The three types of magma.
What is are basaltic, andesitic, and rhyolitic.
400
This is what happens with viscosity as you heat rock.
What is the viscosity lowers?
400
A mushroom shaped pluton with a round top and flat bottom.
What is a laccolith?
400
A mountain with broad gently sloping sides and a nearly circular base.
What is a shield volcano?
400
The name of the large belt of volcanic activity around the pacific ocean.
What is the Ring of Fire or The Circum Pacific Belt?
500
The most explosive type of magma and the percent silica.
What is Rhyolitic and 70%?
500
This is why some volcanic eruptions are so violent.
What is because there is a high silica content, the magma traps gasses, and high viscosity?
500
A pluton that intrudes parallel to rock layers and one that intrudes across pre-existing rock.
What is a sill and a dike?
500
The most explosive type of volcano. Name one.
What is a composite volcano. Mt. Ranier or Mt. St. Helens
500
Some volcanoes are lacated far from plate boundaries. The name for these areas where high temperature plumes of mantle material rise toward the surface are..