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 34 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

chjcharjto14

  • Member
  • Posts: 342
Reply 3 on: Yesterday
Great answer, keep it coming :)

« previous next »
 

Did you know?

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

Did you know?

Allergies play a major part in the health of children. The most prevalent childhood allergies are milk, egg, soy, wheat, peanuts, tree nuts, and seafood.

Did you know?

Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.

Did you know?

The average person is easily confused by the terms pharmaceutics and pharmacology, thinking they are one and the same. Whereas pharmaceutics is the science of preparing and dispensing drugs (otherwise known as the science of pharmacy), pharmacology is the study of medications.

Did you know?

To maintain good kidney function, you should drink at least 3 quarts of water daily. Water dilutes urine and helps prevent concentrations of salts and minerals that can lead to kidney stone formation. Chronic dehydration is a major contributor to the development of kidney stones.

Changes in Earth's atmospheric carbon dioxide levels over geological time. Changes in Earth's atmospheric carbon dioxide levels over geological time.
How to calculate present value using the compound interest formula (Question 1) How to calculate present value using the compound interest formula (Question 1)
Similar Rock Outcrops on Mars and Earth Similar Rock Outcrops on Mars and Earth
Sun's composition of Gases. Sun's composition of Gases.
A spaceship leaves Earth at a steady forward speed of 70% the speed of light. How fast relative ... A spaceship leaves Earth at a steady forward speed of 70% the speed of light. How fast relative ...
Satellite data on primary productivity in the equatorial Pacific Ocean Satellite data on primary productivity in the equatorial Pacific Ocean
Video: Gastrin (gastric emptying) & Secretin (buffering gastric acid)

For a complete list of videos, visit our video library