« previous next »

Author Question: What is the most likely cause of the mantle seismic velocity transition zones at 410 and 660 ... (Read 39 times)

brutforce

  • Hero Member
  • *****
  • Posts: 540
on: Jul 16, 2018
What is the most likely cause of the mantle seismic velocity transition zones at 410 and 660 kilometers?
 
  What will be an ideal response?

Question 2

How was the radius of Earth determined? Is Earth a perfect sphere?
 
  What will be an ideal response?


mcni194

  • Sr. Member
  • ****
  • Posts: 311
Reply #1 on: Jul 16, 2018
Answer to Question 1

The most likely cause of the mantle seismic velocity transition zones at 410 and 660 km is high-pressure repacking of the crystal structures of olivine and pyroxene.

Answer to Question 2

Erastosthenes used geometric relationships to determine Earth's radius. This was later refined. Newton recognized Earth would bulge at its equator due to rotation, and calculated its radius, which would later be used to determine its mass, based on gravitational interaction with other planets.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

Every flu season is different, and even healthy people can get extremely sick from the flu, as well as spread it to others. The flu season can begin as early as October and last as late as May. Every person over six months of age should get an annual flu vaccine. The vaccine cannot cause you to get influenza, but in some seasons, may not be completely able to prevent you from acquiring influenza due to changes in causative viruses. The viruses in the flu shot are killed—there is no way they can give you the flu. Minor side effects include soreness, redness, or swelling where the shot was given. It is possible to develop a slight fever, and body aches, but these are simply signs that the body is responding to the vaccine and making itself ready to fight off the influenza virus should you come in contact with it.

Did you know?

Patients who cannot swallow may receive nutrition via a parenteral route—usually, a catheter is inserted through the chest into a large vein going into the heart.

Did you know?

According to the National Institute of Environmental Health Sciences, lung disease is the third leading killer in the United States, responsible for one in seven deaths. It is the leading cause of death among infants under the age of one year.

Did you know?

Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.

Did you know?

Essential fatty acids have been shown to be effective against ulcers, asthma, dental cavities, and skin disorders such as acne.

The adolescent growth spurt in humans is seen as a “bump” in the height curve and a “spike” in the h The adolescent growth spurt in humans is seen as a “bump” in the height curve and a “spike” in the h
Climate zones in the USA Climate zones in the USA
Velocity Velocity
Rising sea levels will affect millions in coastal zones and on islands Rising sea levels will affect millions in coastal zones and on islands
Climate Zones Climate Zones
Velocity of Blood Flow Velocity of Blood Flow
Video: Humerus Adduction Animation

For a complete list of videos, visit our video library