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

Author Question: Scientists once thought that Earth's primary atmosphere was composed of _____. A) hydrogen and ... (Read 59 times)

michelleunicorn

  • Hero Member
  • *****
  • Posts: 565
on: Jul 27, 2018
Scientists once thought that Earth's primary atmosphere was composed of _____.
 
  A) hydrogen and methane
  B) nitrogen and oxygen
  C) carbon dioxide and methane
  D) oxygen and hydrogen

Question 2

Which of the following is true of Mars?
 
  A) It is about 95 percent of Earth's diameter.
  B) It has a thick atmosphere rich in water vapor.
  C) It is the smallest planet of the Solar System.
  D) It has a heavily cratered crust marked by volcanoes.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

janieazgirl

  • Sr. Member
  • ****
  • Posts: 300
Reply #1 on: Jul 27, 2018
Answer to Question 1

A

Answer to Question 2

D


michelleunicorn

  • Hero Member
  • *****
  • Posts: 565
Reply #2 on: Jul 27, 2018
Thank you!


janieazgirl

  • Sr. Member
  • ****
  • Posts: 300
Reply #3 on: Jul 27, 2018
Always glad to help...


« previous next »
 

Did you know?

More than 50% of American adults have oral herpes, which is commonly known as "cold sores" or "fever blisters." The herpes virus can be active on the skin surface without showing any signs or causing any symptoms.

Did you know?

More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.

Did you know?

The longest a person has survived after a heart transplant is 24 years.

Did you know?

As many as 28% of hospitalized patients requiring mechanical ventilators to help them breathe (for more than 48 hours) will develop ventilator-associated pneumonia. Current therapy involves intravenous antibiotics, but new antibiotics that can be inhaled (and more directly treat the infection) are being developed.

Did you know?

The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.

Water potentials decrease (become more negative) as one moves from soil to plant to atmosphere Water potentials decrease (become more negative) as one moves from soil to plant to atmosphere
Wound healing by primary intention. Wound healing by primary intention.
The structures thought to mediate the sympathetic and behavioral responses conditioned to an ... The structures thought to mediate the sympathetic and behavioral responses conditioned to an ...
The WISER entry for hydrogen cyanide (bottom). Useful information includes detailed health ... The WISER entry for hydrogen cyanide (bottom). Useful information includes detailed health ...
Human of the planet's net primary production and appropriation of NPP Human of the planet's net primary production and appropriation of NPP
The Oceans of Earth The Oceans of Earth
Video: Status Epilepticus

For a complete list of videos, visit our video library