Earthquakes
Where most earthquakes occur.
What is along plate boundaries?
Magma that has reached the Earth's surface.
What is lava?
The type of volcano with gentle slopes made from basalt.
What is a shield volcano?
This type of stress squeezes rock until it folds or breaks.
What is compression?
The force that acts on rock to change its shape or volume.
What is stress?
A machine that measures and records ground motion.
What is a seismometer?
The area where material from deep within the mantle rises then melts, forming magma.
What is a hot spot?
A large, steep-sided volcano made of lava and ash.
What is a composite volcano?
A change in rock that is not permanent.
What is elastic strain?
The huge hole that is left by the collapse of a volcano.
What is a caldera?
The earthquake waves that travel the fastest.
What are P-Waves?
This volcano is not active, but may become active.
What is a dormant volcano?
A small, steep-sided volcano made of basalt.
What is a cinder cone?
A curved line of volcanoes that forms parallel to plate boundaries.
What is a volcanic arc?
When two blocks of rock slide horizontally past each other in opposite directions.
What is a strike-slip fault?
The seismic waves that cause the most damage at Earth's surface.
What are surface waves?
Magma has low silica content and flows easily. Gases bubble out gently and lava oozes slowly.
What is a quiet eruption?
The presence of dissolved _________ in lava increases its explosiveness.
What are gases?
An area of many fractured pieces of crust along a large fault.
What is a fault zone?
The difference between the first P-wave and S-wave.
What is lag time?
Where seismic waves originate.
What is the focus/epicenter?
Fast moving hot lava.
What is pahoehoe?
This forms when magma hardens in a volcano’s pipe.
What is a volcanic neck?
Formed by a collision between two continental plates.
What is a mountain range?
Most of the active volcanoes in the world are located here.
What is the Ring of Fire?