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 45 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
Great answer, keep it coming :)

TheDev123

  • Member
  • Posts: 332
Reply 3 on: Yesterday
Excellent

« previous next »
 

Did you know?

More than one-third of adult Americans are obese. Diseases that kill the largest number of people annually, such as heart disease, cancer, diabetes, stroke, and hypertension, can be attributed to diet.

Did you know?

Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.

Did you know?

Atropine was named after the Greek goddess Atropos, the oldest and ugliest of the three sisters known as the Fates, who controlled the destiny of men.

Did you know?

The average adult has about 21 square feet of skin.

Did you know?

Complications of influenza include: bacterial pneumonia, ear and sinus infections, dehydration, and worsening of chronic conditions such as asthma, congestive heart failure, or diabetes.

Geothermal energy and powers Earth’s systems Geothermal energy and powers Earth’s systems
The Great Ocean Conveyor The Great Ocean Conveyor
Composition of a long bone Composition of a long bone
Student opening present Student opening present
Composition of the Atmosphere Composition of the Atmosphere
Happy earth day jk kid drawing Happy earth day jk kid drawing
Video: Proteins Defined, Hierarchy & Composition of Cells

For a complete list of videos, visit our video library