Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
31 Cards in this Set
- Front
- Back
|
Asthenosphere
|
Soft, weak rock with some melting
|
|
|
Inner core
|
Solid iron-nickle alloy
|
|
|
Outer core
|
liquid iron-nickle alloy that generates Earth's magnetic field
|
|
|
Moho
|
Boundary that separates the crust from the mantle
|
|
|
Which waves are bent going through liquid?
|
P waves
|
|
|
Which waves cannot travel through liquids or gases?
|
S waves
|
|
|
Why can't S waves travel through liquids or gases?
|
Because the gases and liquids do not rebound elastically back to there original shape
|
|
|
Why do P waves bend when they travel into the outer core from the mantle?
|
They can't travel as fast as they can through smaller things.
|
|
|
Composition of the continental crust
|
Granitic rock
|
|
|
Composition of oceanic crust
|
Basaltic rock
|
|
|
Composition of core
|
Similar to metallic meteorites
|
|
|
Composition of mantle
|
Similar to stony meteorites
|
|
|
What collides with Earth that provides evidence for Earth's Inner composition?
|
Meteorites
|
|
|
3 factors that will effect the degree of damage that occurs to structures as result from earthquakes.
|
1. Intensity and duration of the vibrations
2. Nature of material on which the structure is built 3. Design of stucture |
|
|
What kind of building is least likely to be damaged in an earthquake?
|
Steel-frame building
|
|
|
Liquefaction
|
Makes the ground not able to hold buildings
|
|
|
Tsunamis
|
Seismic sea waves
|
|
|
Causes of Tsunamis
|
1. Underwater earthquakes
2. Underwater landslides |
|
|
Areas protected by Warning Systems
|
Coastel areas of the Pacific
|
|
|
Landslides
|
When the soil and rock on slopes fail.
|
|
|
Ground subsidence
|
Sinking of ground triggered by vibrations
|
|
|
What do scientists measure along faults when trying to predict future earthquakes?
|
Temperature of well water and radon gas emissions
|
|
|
Short-range earthquake predictions
|
Not sucsessful
|
|
|
Seismic gap
|
An area along a fault where no earthquake activity has occurred for a long time
|
|
|
Where do most major earthquakes occur?
|
The edge of the Pacific ocean
|
|
|
2 most types of measurements that scientists use to describe the size of earthquakes
|
Intensity and Magnitude
|
|
|
Richter scale
|
Based on the amplitude of the largest seismic wave recorded on a seismogram
|
|
|
Momentum magnitude scale
|
Derived from the amount of displacement that occurs along a fault zone.
|
|
|
Intensity
|
Measure of the amount of earthquake shaking at a location based on damage
|
|
|
Magnitude
|
Measure of the size of seismic waves or amount of energy released at the earthquake source.
|
|
|
Most widely used measurement for earthquakes
|
Momentum magnitude
|
