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

Author Question: Why is the oldest continental crust (4.4 billion years) so much older than the oldest oceanic crust ... (Read 94 times)

Lobcity

  • Hero Member
  • *****
  • Posts: 524
Why is the oldest continental crust (4.4 billion years) so much older than the oldest oceanic crust (180 million years)?
 
  What will be an ideal response?

Question 2

How can we estimate the abundances of chemical elements in the early solar system?
 
  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

alvinum

  • Sr. Member
  • ****
  • Posts: 317
Answer to Question 1

All of the oceanic crust older than 180 million years has been destroyed by subduction.

Answer to Question 2

We can use the composition of meteorites that have not been modified by accretion into planetesimals.




Lobcity

  • Member
  • Posts: 524
Reply 2 on: Jul 16, 2018
Excellent


LVPMS

  • Member
  • Posts: 323
Reply 3 on: Yesterday
Wow, this really help

 

Did you know?

Patients who have been on total parenteral nutrition for more than a few days may need to have foods gradually reintroduced to give the digestive tract time to start working again.

Did you know?

Cucumber slices relieve headaches by tightening blood vessels, reducing blood flow to the area, and relieving pressure.

Did you know?

Carbamazepine can interfere with the results of home pregnancy tests. If you are taking carbamazepine, do not try to test for pregnancy at home.

Did you know?

The newest statin drug, rosuvastatin, has been called a superstatin because it appears to reduce LDL cholesterol to a greater degree than the other approved statin drugs.

Did you know?

Hippocrates noted that blood separates into four differently colored liquids when removed from the body and examined: a pure red liquid mixed with white liquid material with a yellow-colored froth at the top and a black substance that settles underneath; he named these the four humors (for blood, phlegm, yellow bile, and black bile).

For a complete list of videos, visit our video library