Unit 2: Earthquakes and Earth's Interior
Big Idea: A model of the structure and dynamics of Earth's interior where the transfer of heat
|
|
Bill Nye: Inside Our PlanetThis video segment examines Earth's inner and outer cores.
E2.2A - I can describe the interior of the Earth (in terms of crust, mantle, and inner and outer cores) and where the magnetic field of the Earth is generated. Greatest Discoveries with Bill Nye: Earth Science Science Channel, 2005 . Full Video. Discovery Education. Web. 29 September 2014. <http://www.discoveryeducation.com/>. |
|
|
Unit 2 Notes: Earthquakes and Earth's Interior
|
unit_2_notes_-_exploring_earths_interior.pdf | |
File Size: | 39 kb |
File Type: |
Kahn Academy: Seismic WavesThis video explains P-waves and S-waves.
P waves are also know as primary waves. These are the first ones to arrive. P waves are seismic waves that compress and expand the ground like and accordion. P waves can travel through both solids and liquids. S waves are seismic waves, also known as secondary waves, that vibrate from side to side as well as up and down. These shake the ground back and forth. S waves cannot move through liquids. |
Kahn Academy:
The amount of time that it takes for a seismic wave to pass through the earth is dependent on the material that it encounters along its path.
By monitoring arrival times of seismic waves throughout the earth we can make determinations about what types of materials are found in the earth. For example, S waves do not reach from an earthquake to the opposite side of the earth--indicates presence of a liquid core. When traveling through the earth, seismic waves frequently pass through materials that transmit them more or less quickly. Remember that the speed of seismic waves depends on variations in strength and density of the rocks that they pass through. |
Refraction: When seismic waves pass through different types of materials their speed is altered and consequently their path through the materials may be bent.
Kahn Academy:
The Mohorovicic Discontinuity, or "Moho", is the boundary between the crust and the mantle. The red line in the drawing at right shows its location.
In geology the word "discontinuity" is used for a surface at which seismic waves change velocity. One of these surfaces exists at an average depth of 8 kilometers beneath the ocean basin and at an average depth of about 32 kilometers beneath the continents. At this discontinuity, seismic waves accelerate. This surface is known as the Mohorovicic Discontinuity or often simply referred to as the "Moho". |
Kahn Academy:
Scientists infer Earth's inner structure by recording and studying how seismic waves travel through Earth.
|
Kahn Academy:
The three main layers of the Earth are the crust,the mantle, and the core. These layers vary greatly in size, composition, temperature, and pressure.
|
Check out these iPad apps...
Earthquakes:
Folds and Faults - Folds and Faults provides an illustrated overview of two significant topics in geology: folds and faults. Understanding folds and faults helps to explain how mountains form, how layers of rock change shape over time, and the underlying cause of earthquakes. $0.99
Focus on Earthquakes - Focus on Earthquakes provides a comprehensive description of the causes and consequences of earthquakes. In addition to the text, this new-media textbook provides illustrations, photos, narrated animations and slide shows that aid in understanding the concepts presented. Interactive quizzes and review questions are provided throughout the text to test and reinforce one's understanding. $3.99
Disaster Alert - Disaster Alert (by Pacific Disaster Center) provides a listing and an interactive map of Active Hazards occurring around the globe. Additional hazard information can be viewed and shared. Free
Folds and Faults - Folds and Faults provides an illustrated overview of two significant topics in geology: folds and faults. Understanding folds and faults helps to explain how mountains form, how layers of rock change shape over time, and the underlying cause of earthquakes. $0.99
Focus on Earthquakes - Focus on Earthquakes provides a comprehensive description of the causes and consequences of earthquakes. In addition to the text, this new-media textbook provides illustrations, photos, narrated animations and slide shows that aid in understanding the concepts presented. Interactive quizzes and review questions are provided throughout the text to test and reinforce one's understanding. $3.99
Disaster Alert - Disaster Alert (by Pacific Disaster Center) provides a listing and an interactive map of Active Hazards occurring around the globe. Additional hazard information can be viewed and shared. Free