At divergent boundaries, two plates move this way.
What is against each other?
100
At convergent boundaries the plates move this way.
What is toward each other?
100
Transform-Fault Boundaries are where this number of plates slide horizontally past one another. These are also known as transform boundaries or more commonly as faults.
What is two?
100
Earthquakes are recorded by this instrument.
What is a seismograph?
100
A volcano is an opening, or rupture, in this of the Earth.
What is the crust or surface?
200
Oceanic lithosphere consists mainly of this crust.
What is mafic?
200
Continental lithosphere is associated with this crust.
What is continental?
200
At transform-fault boundaries the plates move this way.
What is seafloor?
200
These waves are faster than S waves, and this is what allows us to tell where an earthquake was.
What are P waves?
200
Volcanoes allow hot lava, volcanic ash and gases to escape from this below the surface.
What is a magma chamber?
300
These types of islands are formed by divergent boundaries.
What is volcanic islands?
300
Earthquakes and these are common near convergent boundaries.
What are volcanoes?
300
Most transform faults are hidden in the deep oceans where they form a series of short zigzags accommodating this type of spreading
What is past each other?
300
These "puzzle pieces" moving slowly around, sliding past one another and bumping into each other. The edges of these are called plate boundaries.
What are tectonic plates?
300
These volcanoes are usually about half-half lava and pyroclastic material, and the layering of these products gives them their other common name of composite volcanoes.
What is strato?
400
These are born and grow wider where plates diverge or pull apart.
What are oceans?
400
The lithosphere is underlain by this sphere, the weaker, hotter, and deeper part of the upper mantle.
What is the asthenosphere?
400
This activity is normally not present because the typical magma sources of an upwelling convection current or a melting subducting plate are not present.
What is volcanic?
400
The location below the earth’s surface where the earthquake starts is called the hypocenter, and the location directly above it on the surface of the earth is called this.
What is the epicenter?
400
This material is the finest pyroclast.
What is ash?
500
Divergent boundaries can create massive fault zones in the oceanic ridge system causing massive transform faults to occur. These are the fracture zones that are a major source of these earthquakes.
What is submarine?
500
When two plates move towards one another, they form either a subduction zone or this.
What is a continental collision?
500
This type of fault is a simple offset, while a transform fault is formed between two different plates, each moving away from the spreading center of a divergent plate boundary.
What is a strike slip?
500
These are smaller earthquakes that happen in the same place as the larger earthquake that follows.
What are foreshocks?
500
When an erupting volcano empties a shallow-level magma chamber, the edifice of the volcano may collapse into the voided reservoir, creating this.