« previous next »

Author Question: How did oxygen (O2 ) get into Earth's atmosphere? A) It was captured from the solar nebula. B) ... (Read 95 times)

rachel9

  • Sr. Member
  • ****
  • Posts: 495
on: Jul 27, 2018
How did oxygen (O2 ) get into Earth's atmosphere?
 
  A) It was captured from the solar nebula.
  B) It was outgassed from volcanoes.
  C) It came from chemical reactions with surface rocks.
  D) It was released by life through the process of photosynthesis.

Question 2

An intermediately wound barred spiral galaxy would be
 
  A) BS2.
  B) BSE.5.
  C) SBb.
  D) S2B.
  E) SIrr.


amanda_14

  • Sr. Member
  • ****
  • Posts: 342
Reply #1 on: Jul 27, 2018
Answer to Question 1

D

Answer to Question 2

C


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question

rachel9

  • Sr. Member
  • ****
  • Posts: 495
Reply #2 on: Jul 27, 2018
TY


amanda_14

  • Sr. Member
  • ****
  • Posts: 342
Reply #3 on: Jul 27, 2018
You're welcome


« previous next »
 

Did you know?

Thyroid conditions may make getting pregnant impossible.

Did you know?

As many as 20% of Americans have been infected by the fungus known as Histoplasmosis. While most people are asymptomatic or only have slight symptoms, infection can progress to a rapid and potentially fatal superinfection.

Did you know?

The effects of organophosphate poisoning are referred to by using the abbreviations “SLUD” or “SLUDGE,” It stands for: salivation, lacrimation, urination, defecation, GI upset, and emesis.

Did you know?

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

Did you know?

Eating food that has been cooked with poppy seeds may cause you to fail a drug screening test, because the seeds contain enough opiate alkaloids to register as a positive.

Possible Earth 5 billion years from now Possible Earth 5 billion years from now
The Crab Nebula and Pulsar The Crab Nebula and Pulsar
Earth’s history is divided into nested sets of time--eons, eras, periods, and epochs--and is called Earth’s history is divided into nested sets of time--eons, eras, periods, and epochs--and is called
How Axis Tilt Affects the Intensity of Solar Radiation How Axis Tilt Affects the Intensity of Solar Radiation
Measuring Oxygen Saturation Measuring Oxygen Saturation
Horizontal Pressure Gradients in the Upper Atmosphere Horizontal Pressure Gradients in the Upper Atmosphere
Video: Types of energy transfer reactions: oxidation-reduction reactions and ATP generation reactions

For a complete list of videos, visit our video library