What is A material found in magma that forms from the elements oxygen and silicon.
100
Volcanic eruptions create landforms made of what materials?
What is lava, ash, and other materials.
200
Where do Volcanic belts form?
What is along boundaries of Earth's plates.
200
Some hot spots lie close to what?
What is plate boundaries.
200
A bowl-shaped area that may form at the top of a volcano around the central vent.
What is a Crater.
200
What makes and eruption quiet?
What is Hot magma and low silica.
200
Name the four landforms created by lava, ash , and other materials.
What is a shield, composite, cinder cone, and lava plateaus.
300
Plate movements cause the crust to fracture. These fractures allow what to reach the surface?
What is Magma.
300
How is a hot spot formed?
What is A volcano forms a hot spot when magma erupts through the crust and reaches the surface.
300
The spread of lava as it pours out of a vent.
What is lava flow.
300
What makes and explosive eruption?
What is high silica.
300
What happens sometimes when the main vent and magma chamber are empty?
What is a caldera.
400
What includes the volcanoes along the coasts of North and South America and those in Japan and in the Philippines?
What is The Ring of Fire.
400
A string of volcanoes formed by magma breaking through the ocean floor is known as?
What is an island arc.
400
Molten rock and gas leave the volcano through and opening called a what?
What is a vent.
400
What is a mixture of hot gases, ash, cinders, and bombs?
What is pyroclastic flow.
400
A mass of rock that formed when a large body of magma cools inside the crust.
What is Batholith.
500
What is occuring in this example? One plate can sink beneath the other plate. Water that is brought down with the sinking plate eventually helps to form magma, Which rises to the surface.
What is Plates pushing together, Converging plates.
500
Yellow Stone National Park is an example of a huge what?
What is Hot spot.
500
Magma moves upward through the what?
What is a pipe.
500
What terms do geologists use to describe a volcano's stage of activity?
What is active, dormant, and extinct.
500
What forms when magma hardens in a volcano's pipe and the surrounding rock later wears away?