Earthquakes
The huge pieces of crust that hit each other, move away from each other, and slide against each other are called ________.
What are "plates"?
225 million years ago, all the continents were joined together as one super-continent called ______________.
What is "Pangaea".
After magma reaches the surface of the Earth it is called lava and when it cools it forms ___________rock.
What are "igneous"?
A tsunami is normally caused by an ____________ that takes place in the ocean.
What is "an earthquake".
A _________ is a danger to humans caused by an event.
What is a "hazard".
The cracks between the pieces of crust as they slide past each other are called _________.
What are "faults"?
The theory that plates move and interact with each other is called the theory of plate ____________.
What is "tectonics."
This is the type of volcano that has an explosive eruption.
What is "a stratovolcano".
The earthquakes that cause tsunamis usually occur at _____________ boundaries?
(divergent, sliding(transverse), or convergent)
What is "convergent"
A massive wave created by an earthquake is called a _____________.
What is "tsunami".
The ____________ fault found in California that will eventually move Los Angeles and San Francisco closer together.
What is "San Andreas"?
Natural _____________ such as earthquakes, volcanoes, tsunamis, and volcanic eruptions, can have devastating effects to both natural and man-made structures.
What are "hazards."
Mt. Vesuvius erupted plumes of ________________ ash which buried the city of Pompeii.
What is "pyroclastic"?
When a tsunami warning has been issued, it is best get away from the ocean and move to _________ ground.
What is "higher".
This is an opening in the earth's crust that allows super heated rock and other materials from below the crust to reach the surface.
What is "a volcano".
A seismograph measures the strength or ______________ of an earthquake .
What is "magnitude"?
These are the 4 layers of the Earth.
What are "the crust, the mantle, the outer core, and the inner core."
The ______________ is the location named because it contains more than 450 volcanoes, and is where approx. 90% of the world's volcanoes occur.
What is "Ring of Fire"?
Tsunamis are often wrongly thought to be caused by_______________.
What is "weather/storms".
This shift in the Earth's crust that causes tremors and shaking is called an ________________.
What is "earthquake".
The place under the ground where the earthquake originates at the plates is called the __________ of the earthquake. The spot directly above this spot on the surface of the crust is called the epicenter.
What is "focus"
The theory proposed by Alfred Wegener in 1912 that the continents are moving away from each other is called the Theory of Continental ________.
What is "Drift."
Some volcanoes have not erupted in a long time, but could erupt again. These volcanoes are called _____________.
What is "dormant".
A clear sign that a tsunami is about to occur is when the ocean appears to ________ ________ quickly before it rushes back in with the massive waves.
What is "draw back".
An __________ is a release of volcanic material that can last a few minutes, hours or even years.
What is "eruption."