• Shuffle
Toggle On
Toggle Off
• Alphabetize
Toggle On
Toggle Off
• Front First
Toggle On
Toggle Off
• Both Sides
Toggle On
Toggle Off
Toggle On
Toggle Off
Front

### How to study your flashcards.

Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key

Up/Down arrow keys: Flip the card between the front and back.down keyup key

H key: Show hint (3rd side).h key

A key: Read text to speech.a key

Play button

Play button

Progress

1/9

Click to flip

### 9 Cards in this Set

• Front
• Back
 How thick is the crust of the earth? It is made of several plates, and is about 50 miles thick. These plates move slowly over theearths molten core. T/F TRUE. When 2 plates pull apart or rub together, or collide, the result is an earthquake. What is the hypocenter? It is the location where the earthquake originates. What is the epicenter? It is the point on the earth vertically above the hypocenter. What are P waves? Earthquakes produce a variety of waves. These are the first waves, they flow longitudinally like sound waves, compressing and decompressing the ground. They move quickly and can travel across the world in 20 minutes. What ae S waves? These travel slowly and transversely, displacing walls and fencing. What are L waves? These are the most severe. They cause the ground to move up and down. These cause landslides, and tsunamis. After shock tremors are the result of the ground settling into place. T/F TRUE. What is the Richter scale? This measures the intensity of the earthquake. Each number is an increase by a factor of 10. A 3.0 is ten times stronger than a 2.0, and is 100 times stronger than a 1.0.. Those below 4.0 are rarely felt.