Stressed Out
Stress that pushes a mass of rock in two opposite directions is called _______
Shearing
The point beneath Earth’s surface where rock breaks under stress and triggers an earthquake.
Focus
Before lava reaches the surface, the molten material is called ____?
Magma
When many layers of thin, runny lava build up a high level area, the result is a ____.
Lava plateau
When groundwater heated by magma rises to the surface and collects in natural pools it is called a ____.
hot springs
Which Type of stress forces rocks to fold or break?
Compression
S waves are known as ____.
Secondary waves
The long tube in the ground that connects the magma chamber to the Earth’s surface is a ____?
pipe
Tall, cone-shaped mountains in which layers of lava alternate with layers of ash are called _____.
composite volcano
A large area of flat land elevated high above sea level.
plateau
Stress force that pulls on the crust, stretching rock until it becomes thinner.
Tension
Which waves move the fastest, which move slower?
Primary waves are faster than Secondary waves
What triggers the small earthquakes that occur around a volcano before an eruption?
Upward movement of magma
The huge hole left by the collapse of a volcanic mountain is called a _____.
caldera
A compression that causes the hanging wall to move over the foot wall is called a ____ fault.
reverse fault
Stress that causes a mass of rock to move in opposite directions.
Compression
Geologists draw circles around seismograph stations to determine the location of an earthquake’s ______.
Epicenter
If a volcano’s magma is high in silica, the volcano will probably ____?
erupt explosively
When ash, cinders and bombs build up in a steep pile around a volcano’s vent the result is a ____.
In volcanic areas, groundwater heated by magma is a source of ____?
geothermal energy
Shearing creates ___ faults like the San Andreas fault in California.
Strike-slip
What does a seismograph record?
The ground movements caused by seismic waves
Volcanoes along converging oceanic plate boundaries may form a ____.
Island Arc
When magma hardens in a volcano’s pipe, the result will eventually be a landform called a ____.
volcanic neck
The block of rock that lies above a fault is called ____.