Stress and Faults
Earthquakes
Safety
Volcanoes
Fun Facts
100
Force that acts on rocks and can change shape or volume over time
What is stress
100
Point beneath surface where rock breaks
What is focus
100
Devices that "tie" floors and ceiling to the walls
What are tension ties
100
Slow-moving, high viscosity lava
What is aa?
100
Area of many plate boundaries where most quakes occur
What is the "Ring of Fire"?
200
Hanging wall slides upward
What is a reverse fault
200
Waves released by quake that compress and expands the ground
What are P waves?
200
Two ways to make a home more earthquake resistant
What is fastening furniture and water heater to walls; plywood panels; bolt foundation to house; attach chimney with brackets
200
Formed from the melting of continental crust
What is High Silica Magma?
200
Scientist who studies earthquakes
What is a seismologist?
300
Break in crust
What is a fault
300
Most destructive seismic waves
What are surface waves?
300
Pads that separate building from foundation
What are base isolators
300
Most dangerous explosive eruption
What is pyroclastic flow?
300
Resistance of a liquid to flow
What is viscosity?
400
Fault found at transform boundaries
What is a strike-slip fault
400
Assigns a number to quantify NRG released by quake
What is the Richter scale?
400
Utility companies use these to reduce danger
What are flexible pipes
400
Form when magma squeezes between horizontal layers of rock
What are sills?
400
Number of active volcanoes on Earth
What is 600?
500
Type of boundary at a normal fault
What is divergent
500
Caused by earthquakes underwater
What is a tsunami?
500
Position a person should take during an earthquake
What is drop, cover and hold
500
Formed by a collapsing volcano
What is a caldera?
500
Largest volcanic eruption in continental U.S.
What is Mount St. Helens?
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