This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: How is the composition of Earth's present-day mantle used to support the magma-ocean hypothesis? ... (Read 69 times)

urbanoutfitters

  • Hero Member
  • *****
  • Posts: 530
on: Jul 16, 2018
How is the composition of Earth's present-day mantle used to support the magma-ocean hypothesis?
 
  What will be an ideal response?

Question 2

What evidence supports the hypothesis that Earth's early atmosphere (before 2.3 billion years ago) did not contain oxygen?
 
  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

Koolkid240

  • Sr. Member
  • ****
  • Posts: 357
Reply #1 on: Jul 16, 2018
Answer to Question 1

The fact that the composition of Earth's present day mantle is poor in strongly iron-seeking elements, rich in slightly iron-seeking elements and has intermediate concentrations of moderately iron-seeking elements is consistent with the magma-ocean hypothesis.

Answer to Question 2

The Precambrian iron-ores of the U.S. Great Lakes Region, South America, and Australia indicate the lack of oxygen during early Earth history. These iron ores are peculiar chemical sedimentary rocks that cannot form from water that contains oxygen (as the modern oceans do).


urbanoutfitters

  • Member
  • Posts: 530
Reply 2 on: Jul 16, 2018
Wow, this really help

olderstudent

  • Member
  • Posts: 339
Reply 3 on: Yesterday
Excellent

« previous next »
 

Did you know?

Serum cholesterol testing in adults is recommended every 1 to 5 years. People with diabetes and a family history of high cholesterol should be tested even more frequently.

Did you know?

In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.

Did you know?

Long-term mental and physical effects from substance abuse include: paranoia, psychosis, immune deficiencies, and organ damage.

Did you know?

The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

Did you know?

Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.

Changes in boreal forest composition along a chronosequence in Quebec. Dates refer to the year of th Changes in boreal forest composition along a chronosequence in Quebec. Dates refer to the year of th
The Sun is the nearest star to Earth. The Sun is the nearest star to Earth.
Effect of clinical decison support systems Effect of clinical decison support systems
A fuel composition tester (SPX Kent-Moore J-44175) is the recommended tool, by General Motors, to ... A fuel composition tester (SPX Kent-Moore J-44175) is the recommended tool, by General Motors, to ...
How to calculate present value (Question 2) How to calculate present value (Question 2)
Ocean cover most of Earth’s surface Ocean cover most of Earth’s surface
Video: Prone Position

For a complete list of videos, visit our video library