Volcanoes and Plate Tectonics
Volcanic Eruptions
Volcanic Landforms
Potpourri
100
A major belt of volcanoes that rim the Pacific Ocean.
What is the Ring of Fire?
100
Opening where molten rock and gas leave the volcano.
What is the vent?
100
Magma that forces itself vertically across rock layers and hardens.
What is a dike?
100
Molten mixture of rock-forming substances, gases, and water from the mantle.
What is magma?
200
A mountain that forms in Earth's crust when molten material, or magma, reaches the surface.
What is a volcano?
200
Long tube that extends from Earth's crust up through the top of the volcano connecting magma chamber to Earth's surface.
What is the pipe?
200
The hole left when a volcano collapses.
What is a caldera?
200
Bowl-shaped area that may form at the top of a volcano around the central vent.
What is the crater?
300
Place where volcanic belts form.
What is along the boundaries of Earth's plate?
300
Mixture of hot gases, ash, cinders, and bombs that flow down the sides of a volcano when it erupts explosively.
What is a pyroclastic flow?
300
Tall, cone-shaped mountains in which layers of lava alternate with layers of ash.
What is a composite volcano?
300
Three stages of volcanic activity.
What is active, dormant, and extinct?
400
An area where material from deep within Earth's mangle rises through the crust and melts to form magma.
What is a hot spot?
400
Material found in magma that forms from the elements oxygen and silicon.
What is silica?
400
Forms when magma hardens in a volcano's pipe and surrounding rock later wears away.
What is a volcanic neck?
400
Two types of boundaries where volcanoes form.
What are convergent and divergent?
500
String of islands formed from magma breaking through the ocean floor forming volcanoes.
What is an island arc?
500
Type of rock that forms from fast-moving hot lava that is thin and runny.
What is Pahoehoe?
500
Mass of rock formed when a large body of magma cools inside the crust.
What is a batholith?
500
Magma that squeezes between horizontal rock layers and hardens.
What is a sill?
M
e
n
u