Causes of Earthquakes
Breaks in the earth's surface
What is a fault?
The idea that earth's crust is made up of moving plates
What is plate tectonics?
Gradually sloping volcano with a continuous flow of lava
What is a shield volcano?
Magma that breaks the earth's surface
What is lava?
What is igneous rock?
The fault that occurs when rocks push together
What is a reverse fault?
The beginning point of an earthquake
What is the focus?
A volcano that has erupted before and will erupt again
What is an active volcano?
The area around the Pacific Ocean where volcanoes occur most
What is the Ring of Fire?
Vibrations of energy flowing from the focus of a volcano
What are seismic waves?
The fault that occurs as rocks move apart
What is a normal fault?
The point on the surface of earth directly above the focus
What is the epicenter?
A volcano that has erupted before and is NOT expected to erupt again
What is a dormant volcano?
Volcanic fog
What is vog?
Two of the three places we learned that volcanic activity may occur
What are under the sea, at hot spots, and along the Ring of Fire?
What is a strike-slip fault?
The strength of an earthquake's seismic waves
What is magnitude?
A large cone-shaped volcano that is made of many layers of hardened lava
What is a composite cone volcano?
Mud and rock fragments that surge down a mountain when part of it collapses
What is debris flow?
The scale that measures the magnitude of an earthquakes seismic waves
What is the Richter Scale?
Another cause of an earthquake (other than a type of fault)
The crust and upper area of the mantle
What is the lithosphere?
A volcano that resembles a hill and has a bowl-like crater at the top
What is a cinder cone volcano?
Avalanche-like emissions of red-hot dust and gases
What is pyroclastic flow?
A device used to detect, time, and measure the movements of the earth
What is a seismograph?