Divergent Plate Boundaries
At convergent boundaries the plates move this way.
What is moving toward each other?
Cracks in earths crust where there is movement
What is a fault ?
natural vibrations of the ground caused by movement along gigantic fractures in (Earth’s) crust
What are Earthquakes?
A mixture of molten rock, suspended mineral grains, and dissolved gases deep beneath Earth’s surface
What is magma ?
New seafloor is made due to this
What is seafloor spreading ?
In this fault the hanging wall moves upward past the footwall
What is a reverse fault?
the deformation of materials in response to stress
What is a strain
A mountain or opening in Earth’s crust from which lava erupts
What is a volcano
What is a normal fault ?
This type of stress occurs at convergent boundaries (& reverse faults)
What is compression
What kind of volcano is formed when the silica content is low
What is a shield volcano?
This fault is the most known fault that travels California's coast.
What is the San Andrea's fault
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?
Rock fragments thrown into the air during a volcanic eruption
What is Tephra
Where new ocean floor is created as the Earth's tectonic plates spread apart. As the plates separate, molten rock rises to the seafloor, producing enormous volcanic eruptions of basalt
What is a mid ocean ridge ?
When two plates move towards one another, and the more dense oceanic crust moves under the less dense continental crust
What is subduction
a fault in which rocks are displaced mainly in a horizontal direction, parallel to the line of the fault.
What is a strike slip fault?
causes a material to twist – at transform boundaries (& strike-slip faults)
What is shearing ?
When an erupting volcano empties a shallow-level magma chamber, the volcano may collapse into the voided reservoir, creating this.
What is a caldera?