This topic contains a solution. Click here to go to the answer

Author Question: How do geologists learn about Earth's interior? What will be an ideal ... (Read 45 times)

Haya94

  • Hero Member
  • *****
  • Posts: 558
How do geologists learn about Earth's interior?
 
  What will be an ideal response?

Question 2

How fast do seismic waves move through different rocks and under different conditions?
 
  What will be an ideal response?



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

britb2u

  • Sr. Member
  • ****
  • Posts: 331
Answer to Question 1

Answer: Some rocks seen at Earth's surface formed as much as 50 kilometers or (rarely) as far as 150 kilometers below the surface. These rocks reveal mostly felsic continental crust and mafic oceanic crust, both of which overlie peridotite mantle. The rocks found near the surface cannot account for the density of the whole Earth. Along with wobbles in Earth's rotation, the high overall density of the planet implies a central core of material that is much denser than mantle peridotite.

Answer to Question 2

Answer: Waves move very slowly through the air or water that fills the pore spaces between the solid sediment grains. Seismic waves in igneous rocks are generally fast, and they move faster in mafic gabbro than felsic granite and even faster in ultramafic rocks; these differences between rock types indicate the importance of mineral types on seismic velocity. Seismic velocity also varies with changes in temperature and pressure. As an analogy, consider what would happen if you were holding onto one end of a rubber pole in one hand and one end of a steel pole in the other hand while someone struck the opposite ends of the poles with a hammer. You would feel much stronger vibrations through the steel pole than through the rubber pole. This happens because the body waves initiated by the hammer blows cause more squeezing and twisting within the rubber than within the steel, so the waves travel more efficiently, and thus faster, through the steel.




Haya94

  • Member
  • Posts: 558
Reply 2 on: Jul 16, 2018
:D TYSM


jordangronback

  • Member
  • Posts: 339
Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

 

Did you know?

Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.

Did you know?

As many as 28% of hospitalized patients requiring mechanical ventilators to help them breathe (for more than 48 hours) will develop ventilator-associated pneumonia. Current therapy involves intravenous antibiotics, but new antibiotics that can be inhaled (and more directly treat the infection) are being developed.

Did you know?

Everyone has one nostril that is larger than the other.

Did you know?

Disorders that may affect pharmacodynamics include genetic mutations, malnutrition, thyrotoxicosis, myasthenia gravis, Parkinson's disease, and certain forms of insulin-resistant diabetes mellitus.

Did you know?

Hyperthyroidism leads to an increased rate of metabolism and affects about 1% of women but only 0.1% of men. For most people, this increased metabolic rate causes the thyroid gland to become enlarged (known as a goiter).

For a complete list of videos, visit our video library