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 86 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
YES! Correct, THANKS for helping me on my review

nguyenhoanhat

  • Member
  • Posts: 332
Reply 3 on: Yesterday
:D TYSM

« previous next »
 

Did you know?

About 60% of newborn infants in the United States are jaundiced; that is, they look yellow. Kernicterus is a form of brain damage caused by excessive jaundice. When babies begin to be affected by excessive jaundice and begin to have brain damage, they become excessively lethargic.

Did you know?

In most climates, 8 to 10 glasses of water per day is recommended for adults. The best indicator for adequate fluid intake is frequent, clear urination.

Did you know?

The most common treatment options for addiction include psychotherapy, support groups, and individual counseling.

Did you know?

Patients who cannot swallow may receive nutrition via a parenteral route—usually, a catheter is inserted through the chest into a large vein going into the heart.

Did you know?

Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.

social support for the family caregiver social support for the family caregiver
Model of a nursing clinical decision support system Model of a nursing clinical decision support system
Scattergrams are a mechanism used by political scientists to show patterns and relationships among v Scattergrams are a mechanism used by political scientists to show patterns and relationships among v
Testing a Simple Hypothesis Testing a Simple Hypothesis
Obliquity "Tilt of Earth on its axis" Obliquity "Tilt of Earth on its axis"
Ocean sediment cores preserve a record of ice sheet growth and decay Ocean sediment cores preserve a record of ice sheet growth and decay
Video: TRH/TSH/Thyroid hormone

For a complete list of videos, visit our video library