Compared to P waves and S waves, surface waves move faster or slower.
What is slower?
100
The point beneath earth's surface where rock breaks under stress and triggers an earthquake is called this. Hint: it's not the epicenter.
What is the focus?
100
In sea floor spreading, molten material rises from the mantle and erupts here.
What is along mid-ocean ridges?
100
Stress that pushes a mass of rock in two opposite directions is called this.
What is shearing?
100
In a normal fault, the part of the fault that lies below the other part is called this. Hint, it's the opposite of the head.
What is a footwall?
200
Wagener's hypothesis of continental drift states this one huge point.
What is continents were once a single landmass?
200
The type of force in earth's crust in which plate motions squeeze the crust causing it to become shorter are called this.
What is compression?
200
The main factor that accounts for the difference between quiet and explosive volcanic eruptions is this. Silicon Valley might have some of this.
What is the silica content of the magma?
200
This type of stress produces reverse faults.
What is compression?
200
A break in earth's crust along which two pieces of crust slide past each other with little up or down motion is called this. Think bowling and baseball.
What is a strike-slip fault?
300
Geologists think the movement of earth's plates is caused by this. Do have to try hard to CONvince someone of this.
What is convection currents?
300
If there are small earthquakes near a volcano this is what's probably going to happen next.
What is it probably will erupt?
300
The main hazard from a quiet volcanic eruption is this. You gotta LOVE this stuff.
What is lava flows?
300
A collision between two pieces of continental crust at a converging boundary produces this. Don't make a molehill out of this.
What is a mountain range?
300
The term for the supercontinent that existed even before Mr. Strutz was called this.
What is Pangea?
400
The geological theory that the earth's plates are in constant motion is called this.
What is plate tectonics?
400
This provides the force that causes magma to erupt at the surface.
What is dissolved gasses trapped in the magma?
400
The formation of volcanoes and mountain ranges can be explained by this theory.
What is Plate tectonics?
400
These are the three stages of volcanoes.
What are active, dormant and extinct?
500
The lithosphere is broken into sections called these which float on top of the asthenosphere.
What are plates?
500
Vibrations that move through the ground carrying the energy released during an earthquake are called this. Hope you SIZE this question up first.
What are seismic waves?
500
When ash, cinders and bombs build up in a steep pile around a volcano, the result is this. Hope you CONE guess what it is.
What is a cinder cone volcano?
500
Traces of organisms preserved in rock is called this.
What are fossils?
500
A dormant volcano will erupt sooner or later than an active one.