Chapter 8 and 9 review

What cause an earthquake?
Earthquakes are caused by the vibration of earth produces by the sudden release of energy
Describe the location of an epicenter and focus
Epicenter is the location on the surface of earth directly above the focus
What is the elastic rebound hypothesis? How does it relate to an earthquake?
Elastic rebound hypothesis is the release of built-up energy. Most earthquakes are produced by the release of elastic energy stored in rocks that has been subjected to great forces
Describe the aftershock and fore shocks.
Aftershocks are small quakes that come after a major earthquake. Foreshocks are small quakes that come before earthquakes.
How are earthquakes measured?
Two different types of measurements to describe the size of an earthquake – Intensity and Magnitude
Describe the following earthquake waves: surface, S waves, and P waves
Surface waves= shake particles at right angles to their direction and travel
How do scientist locate earthquakes?
The difference in of P waves provides a way to locate the epicenter and they can use seismograph
Where do most earthquakes occur?
Most of the earthquakes occur around the outer edge of the pacific ocean.
What is liquefaction?
Stable soil turns into a liquid that is not able to support the building or other structures
What causes tsunamis?
They are triggered by earthquakes
What are some other dangers that can occur due to earthquakes?
Landslides and ground substances or the sinking of the ground and also fires
Describe the layers of the earth:
Crust-lithosphere, Mantle-Asthenosphere, Outer Core, Inner Core
Describe the continental drift:
The continents had once been joined to form a single superconitent
Who came up with the idea of continental draft?
Alfred Wegner
What is Pangaea?
Where did Pangaea form?
500 MY
What kind of evidence is present to verify the idea of continental drift?
What is plate tectonics?
The upper most mantle along with the over laying crust behaves a strong rigid layer
How many plates are there?
What happens at plate boundaries?
Describe each boundaries and tell what is happening to each:
What are some evidences of plate tectonics:
What is the driving force of plate tectonics?
What are hot spots?