Show:
Earthquakes
Seismic Waves
The Earth’s Layers
Continental Drift
Words
100
Most occur when stress builds along a zone of weakness or a break in the rock known.
What is a "fault"?
100
Primary (they arrive first), Pressure, or Push-Pull, and the material expands and contracts and particles move back and forth in the path of the wave.
What is a "p-wave"?
100
In most places, a thin layer of sedimentary rocks covers the mostly granite-like rocks.
What is the "continental crust"?
100
In 1912 he ?proposed that in the ?distant past, Earth’s ?continents were all joined as a single landmass.
Who is "Alfred Wegener"?
100
Refraction (bending) of the waves at the mantle-core boundary causes this ring-shaped region.
What are the "shadow zones"?
200
The place underground where the break occurs in an earthquake.
What is the "focus"?
200
Secondary (arrive later), Shear, or Side-to-side, and the material shears out of shape and snaps back. Travels only through solids.
What is an "s-wave"?
200
Under layers of ?marine sediments, ?is composed of ?darker and denser ?rocks similar to ?basalt.
What is the "oceanic crust"?
200
If the land areas were brought back together, the move would line up ancient mountain ranges, similar continental rock formations and evidence of ancient glaciers.
What is "Pangea"?
200
A large number of the world’s volcanoes and seismic events occur around the edges of the Pacific Ocean.Japan, the western coast of the United States. These areas ?are damaged ?frequently by ?earthquakes ?and volcanoes.
What is the "ring of fire"?
300
The location at the Earth’s surface just above the focus of an earthquake.
What is the "epicenter"?
300
These travel along the earth's surface and are the slowest waves but the ones that damage in large earthquakes.
What is a "surface wave"?
300
Earthquake waves travel faster in the this than they do in the crust and it is composed mostly ?of dense, the dark ?mafic minerals ?olivine and ?pyroxene.
What is the "mantle"?
300
The surface of Earth is composed of about a dozen major rigid, moving crustal plates and several smaller plates.
What is "plate tectonics"?
300
Earthquakes can cause these large waves in oceans.
What are "tsunamis"?
400
Seismographs are the most reliable measures of earthquakes and each increase in one unit of magnitude means a ten-fold increase in shaking.
What is the "Richter Scale"?
400
To find the ?this, ?a seismologist needs to know the arrival and travel time of ?the P-waves.
What is an "origin time"?
400
This is thought to be liquid because S-waves are unable to pass through it.
What is the "outer core"?
400
As a result of this collision mountains rise as the crust crumples.
What is "convergent boundaries"?
400
These may spew hot ?lava, hot ash, and/or toxic gases.
What are "volcanoes"?
500
The measure of intensity based upon the reports of people who experienced the earthquake and observed the destruction.
What is the "Mercalli Scale"?
500
Scientists who study earthquakes.
What is a "seismologist"?
500
This ?seems to be solid
What is the "inner core"?
500
When a plate slides past another plate.
What is a "transform boundary"?
500
This is the most reliable measures of earthquakes.
What is a "seismograph"?