Location, Location, Location!
Most volcanoes and earthquakes are located close to ________ ________.
Plate Boundaries
What is the largest or most massive type of volcano?
Shield Volcano
What type of volcano has "quiet" eruptions?
Shield Volcano
A seismic wave that compresses and expands the ground like an accordion.
Primary wave or P wave
The pattern of lines that show seismic waves on the paper is known as a ________________.
Seismogram
What causes volcanoes that are located in the middle of a plate?
Hot Spots
A volcano made of several layers of ash and lava.
Stratavolcano or Composite
What type of volcano creates pyroclastic flows.
Composite or stratavolcano
The area beneath the Earth's surface where rock that was under stress begins to break or move.
Focus
Magma that has a composition that is high in ___________ would have a high viscosity and would produce explosive eruptions.
Silica
What land feature is formed when there is a divergent boundary on land?
Rift Valley
What volcanic hazard buries, burns, and destroys everything in its path?
Pyroclastic Flow
S waves can travel through ________ only.
solids
An earthquake's _____________________ is a single number that geologists assign to an earthquake based on the earthquake's size.
Magnitude
What volcano is smallest in size?
Cinder Cone
This is a sign that a volcano might erupt and it can be measured on a seismograph.
Earthquakes
A(n) ________________ is the spread of lava that pours out of a volcano.
Lava Flow
The point on the earth's surface directly above the point where an earthquake occurs.
Epicenter
What is the minimum number of recording stations you would need in order to determine the location of an epicenter?
3
What type of lava forms a shield volcano?
Runny lava low in silica
Island arc volcanoes are formed along what type of boundary?
Subduction zone or convergent boundary
What type of volcanic rock has the most silica in it?
Ryolite or Granitic (Ryolite is the extrusive equivalent to granite.) Composite Volcanic Rock
What force causes the movement of the Earth's plates?
convection currents
How do geologists determine the distance an epicenter is from a seismic recording station?
Calculate the difference in arrival time between P waves and S waves
What is the name of the fault line in California?
San Andreas Fault