« previous next »

Author Question: How do geologists determine the composition of Earth's interior? Why not examine it directly? ... (Read 56 times)

bobbysung

  • Hero Member
  • *****
  • Posts: 519
on: Jul 16, 2018
How do geologists determine the composition of Earth's interior? Why not examine it directly?
 
  What will be an ideal response?

Question 2

Approximately what percent of geologic time is represented by the Precambrian? Which period within the Phanerozoic eon represents the longest interval of time? How long is it?
 
  What will be an ideal response?


juiceman1987

  • Sr. Member
  • ****
  • Posts: 316
Reply #1 on: Jul 16, 2018
Answer to Question 1

Energy from earthquakes allows scientists to model its composition. The distance and temperatures are too great to penetrate deep into much of Earth's lithosphere, let alone the rest of the planet.

Answer to Question 2

3958 out of 4500 million years which is approximately 3958/4500 or 88; Cretaceous Period 145 -65 = 80 million years.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question

bobbysung

  • Hero Member
  • *****
  • Posts: 519
Reply #2 on: Jul 16, 2018
Correct answers!


juiceman1987

  • Sr. Member
  • ****
  • Posts: 316
Reply #3 on: Jul 16, 2018
Great! Please up vote :D


« previous next »
 

Did you know?

Most strokes are caused when blood clots move to a blood vessel in the brain and block blood flow to that area. Thrombolytic therapy can be used to dissolve the clot quickly. If given within 3 hours of the first stroke symptoms, this therapy can help limit stroke damage and disability.

Did you know?

Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.

Did you know?

Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.

Did you know?

Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.

Did you know?

In 2006, a generic antinausea drug named ondansetron was approved. It is used to stop nausea and vomiting associated with surgery, chemotherapy, and radiation therapy.

Solar particles interact with Earth's magnetosphere. Sizes not to scale. Solar particles interact with Earth's magnetosphere. Sizes not to scale.
Plnaet Earth Plnaet Earth
How to use the discriminant to determine the value of k in a quadratic with one real root How to use the discriminant to determine the value of k in a quadratic with one real root
Earth Science, 14/E Earth Science, 14/E
Earth’s Spheres Earth’s Spheres
Early Earth Early Earth
Video: Vasectomy

For a complete list of videos, visit our video library