« previous next »

Author Question: What is the most likely cause of the mantle seismic velocity transition zones at 410 and 660 ... (Read 46 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?

Vaccines prevent between 2.5 and 4 million deaths every year.

Did you know?

Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.

Did you know?

Approximately one in three babies in the United States is now delivered by cesarean section. The number of cesarean sections in the United States has risen 46% since 1996.

Did you know?

In the ancient and medieval periods, dysentery killed about ? of all babies before they reach 12 months of age. The disease was transferred through contaminated drinking water, because there was no way to adequately dispose of sewage, which contaminated the water.

Did you know?

The U.S. Pharmacopeia Medication Errors Reporting Program states that approximately 50% of all medication errors involve insulin.

Pressure Zones Drive Winds Pressure Zones Drive Winds
Pressure Zones Drive Winds Pressure Zones Drive Winds
Effleurage to transition to forearm-distal to proximal. Apply effleurage with moderate pressure to ... Effleurage to transition to forearm-distal to proximal. Apply effleurage with moderate pressure to ...
Calculate the velocity of the red rock after collision Angle measured counterclockwise from the ... Calculate the velocity of the red rock after collision Angle measured counterclockwise from the ...
The Zones of Injury Commonly Caused by a Thermal Burn The Zones of Injury Commonly Caused by a Thermal Burn
Video: Cognitive development by Piaget (Preoperational stage or intelligence)

For a complete list of videos, visit our video library