a mass of rock formed when a large body of magma cools inside the crust. They form the core of many mountain ranges.
What is batholith
100
a _____ _______ is where magma is collected beneath a volcano
What is magma chamber
100
name the 2 types of categories scientists classify volcanic eruptions
What is quiet & explosive
100
a dead volcano that is unlikely to ever erupt again
What is extinct
100
tall, cone-shaped mountains in which layers of lava alternate with layers of ash
What is composite volcanoes
200
What famous chain of islands was formed by harden lava?
What is Hawaii
200
where magma moves upward through the ____; a long tube that extends from Earth's crust up through the top of the volcano, connecting the magma chamber to the surface
What is pipe
200
a material found in magma that forms from the elements oxygen and silicon.
What is silica
200
a sleeping volcano that scientists expect to awaken in the future and become active
What is dormant
200
steep, cone-shaped hill or small mountain
What is cinder cone
300
what country has the most active volcanoes? (in the world)
What is Indonesia
300
molten rock and gas leave the volcano through an opening
What is vent
300
name the 2 types of lava for quiet eruptions
What is pahoehoe & aa
300
What usually causes volcanoes to erupt?
What is earthquakes
300
gently sloping mountain
What is shield volcano
400
What is the percentage of volcanoes are in the Ring of Fire?
What is 81%
400
a bowl-shaped area that may form at the top of a volcano around the central vent
What is crater
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 detects slight surface changes in elevation and tilt caused by magma moving underground?
What is tiltmeters
400
when magma hardens in a volcano's pipe and the surrounding rock later wears away
What is volcanic neck
500
where is the largest batholith located in the world?
Hint: North America (it covers two areas)
What is the british columbian batholith
500
the spreading of lava as it pours out of a vent
What is lava flow
500
Take a guess! How many eruptions happen in Indonesia in 1 year?
What is 28
500
Why do geologists think Mount St. Helens is an active volcano?
What is it has erupted many times in the past 4,000. Geologists say its the most active volcano in the U.S.A.
500
1.magma that forces itself across rock layers, then hardens into ____
2. magma that squeezes between horizontal rock, then hardens to form a _____