« previous next »

Author Question: How do geologists determine the composition of Earth's interior? Why not examine it directly? ... (Read 59 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?

There are 20 feet of blood vessels in each square inch of human skin.

Did you know?

There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

Did you know?

Automated pill dispensing systems have alarms to alert patients when the correct dosing time has arrived. Most systems work with many varieties of medications, so patients who are taking a variety of drugs can still be in control of their dose regimen.

Did you know?

Sildenafil (Viagra®) has two actions that may be of consequence in patients with heart disease. It can lower the blood pressure, and it can interact with nitrates. It should never be used in patients who are taking nitrates.

Did you know?

Acetaminophen (Tylenol) in overdose can seriously damage the liver. It should never be taken by people who use alcohol heavily; it can result in severe liver damage and even a condition requiring a liver transplant.

The Sun is the nearest star to Earth. The Sun is the nearest star to Earth.
How to find the sum of the interior angles of any polygon How to find the sum of the interior angles of any polygon
Apply knee to chest stretch for posterior hip and leg muscles. Facing the table directly, place one ... Apply knee to chest stretch for posterior hip and leg muscles. Facing the table directly, place one ...
Determine the enthalpy change of this reaction Determine the enthalpy change of this reaction
Sketch the graph using the tables providing. Determine if each function is continuous or ... Sketch the graph using the tables providing. Determine if each function is continuous or ...
Use of forward and reverse genetics to determine gene function Use of forward and reverse genetics to determine gene function
Video: Interview with Person who has Panic Attacks

For a complete list of videos, visit our video library