Measuring Earthquakes
This scale uses surveys filled out by people who experienced an earthquake.
The Mercalli Scale
This is where to pieces of rock rub together and also where earthquakes start.
A fault
He was the first person to think of the theory of continental drift.
Wegener
This is a weak spot in earth's crust where molten material comes to the surface.
A VOLCANO!
This is Mr. T's middle name
Robert
This scale is older and is based on a reading from a seismograph.
Richter Scale
This is the spot above ground where an earthquake is centered.
Epicenter
This phenomenon deep inside the ocean contributes to continental drift.
Sea floor spreading
This "collection" contains about 75% of the world's volcanoes.
The Ring of Fire
This is the city you are in right now.
Orange
You need at least _____ reading to determine where an earthquake's epicenter is located.
3
This is the force that builds up in rock and then is released in an earthquake
Stress
This is the name of the SUPER CONTINENT that used to exists millions of years ago.
Pangea
This volcano in Washington state erupted when Mr. T was a baby.
Mt. Saint Helens
This is the year the first Simpson's episode aired.
1989
Focus
This is what you should do when an earthquake starts
DROP, COVER, HOLD!
Coal fields in these 2 different continents point to all continents being connected millions of years ago.
Europe and North America.
Plate boundaries
This phrase from MST3K is written on Mr. T's water bottle.
I should really just relax.
Moment magnitude scale
This happens when an earthquake strikes in an area with wet, sandy soil.
Liquefaction
These types of currents are responsible for moving materials in the asthenosphere.
Convection currents
This dark, glassy volcanic rock was once used to make arrowheads. It is also in Minecraft.
Obsidian
Many children in the US started talking with British accents after watching this cartoon.