volcano facts
volcano forms
igneous rocks
eruptions
100
A volcano that is not currently active is called this
What is dormant
100
the 3 types of volcanoes
What is cindercone, shield, composite
100
this forms when magma cools underground
What is Intrusive igneous rock
100
eruptions can either be one of these 2 things
What are explosive or quiet
200
A volcano that is sometimes erupting smoke, steam, ash, cinders, and flows of lava
What is Active
200
this type of volcano has gently sloping sides
What is shield
200
these are the Largest rock bodies. They form when magma cools underground without reaching surface
What are Batholiths
200
how a volcano erupts depends on these 2 factors
What is how much silica and how much gas pressure
300
Magma is slowly forced upward and flows out through an opening called this
What is a vent
300
this type of volcano is formed by erupted lava that covers a layer of tephra over and over again
What is composite
300
Magma that squeezes into vertical cracks in rock below the surface and then hardens is called this
What is a dike
300
Magma that has little silica produces these type of eruptions
What is quiet, nonexplosive eruptions
400
The steep walled depression around the volcano’s vent is called this
What is crater
400
this type of volcano forms when tephra falls to the ground it forms a steep sided, loosely packed volcano
What is cinder cone
400
Magma that is squeezed into a horizontal crack between rock layers and hardens is called this
What is a sill
400
Gases such as these are trapped by magma by the pressure of surrounding magma and rock.
What is water vapor and carbon dioxide
500
name the 3 different ways a volcano can form based on plate tectonic concepts
plates moving toward each other, plates moving away from each other, hot spots
500
Mount St. Helens or Mount Shasta are examples of this type of volcano
What is composite
500
a solid, igneous core of a volcano left behind when a volcano stops erupting and the softer cone erodes away is called this
What is a volcanic neck
500
describe the 2 factors that control eruptions in regards to a shield volcano
What is silica poor and gas that would not be highly pressurized, just slowly "leak" out since it is a quiet eruption
M
e
n
u