Earthquakes
Where most earthquakes occur.
What is along plate boundaries?
The boundaries along which most volcanoes erupt.
What are divergent plate boundaries?
The type of volcano with gentle slopes made from basalt.
What is a shield volcano?
A fast moving, avalanche of hot gas, ash, and rock that erupts from an explosive volcano.
What is pyroclastic flow?
Measures the total energy released by an earthquake.
What is the moment magnitude scale?
The Modified Mercalli scale measures this.
What is the damage done by an earthquake?
Volcanoes form when magma
a. flows through the crust.
b. changes in composition.
c. hardens beneath the surface.
What is
a. flows through the crust.
A large, steep-sided volcano made of lava and ash.
What is a composite volcano?
Forms when meltwater mixes with mud and ash on the mountain.
What are mudflows?
By studying earthquakes, scientists have learned more about the __________ and __________ of Earth's interior.
What is the composition and structure?
Which earthquake waves travel faster, P-Waves or S-Waves?
What are P-Waves?
Magma that is rich in gases will form a volcano
A. that erupts explosively.
B. with gently sloping sides.
C. whose lava has a low viscosity.
What is
A. that erupts explosively.
A small, steep-sided volcano made of basalt.
What is a cinder cone?
Earathquakes are vibrations in the ground that result from movement along breaks in Earth's _____________.
What is lithosphere?
Large and explosive volcanic eruptions can change climate because ash and gas that erupt high into the atmosphere can do this.
What is reflect sunlight?
The type of boundary the deepest earthquakes occur?
What is convergent?
True or False
Subduction of tectonic plates at a boundary is NOT a volcanic hazard.
True
The presence of dissolved _________ in lava increases its explosiveness.
What are gases?
Seismic waves that cause the most damage at Earth's surface.
What are surface waves?
This state has no active volcanoes?
A. California
B. Hawaii
C. Washington
D. New York
What is
D. New York?
Seismic waves originate here.
What is the epicenter?
Volcanoes that are not associated with plate boundaries.
What is Hot Spots?
Volcanoes that erupt rhyolitic or andesitic lava are explosive because the lava is high in this.
What is silica?
A break in Earth's lithosphere where one block of rock moves toward, away from, or past another.
What is a fault?
Most of the active volcanoes in the United States are located here.
What is the Ring of Fire?