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

Author Question: Near Earth's surface, ____ occupies about 78 and ____ about 21 of the total volume of dry air. A) ... (Read 90 times)

faduma

  • Hero Member
  • *****
  • Posts: 528
on: Jul 13, 2018
Near Earth's surface, ____ occupies about 78 and ____ about 21 of the total volume of dry air.
 A) nitrogen; oxygen
  B) hydrogen; oxygen
  C) oxygen; hydrogen
  D) nitrogen; water vapor

Question 2

The most abundant gases in Earth's present day atmosphere (by volume) are ____.
 A) carbon dioxide and nitrogen
  B) oxygen and water vapor
  C) nitrogen and oxygen
  D) oxygen and helium


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

xiazhe

  • Sr. Member
  • ****
  • Posts: 331
Reply #1 on: Jul 13, 2018
Answer to Question 1

A

Answer to Question 2

C


faduma

  • Member
  • Posts: 528
Reply 2 on: Jul 13, 2018
:D TYSM

diana chang

  • Member
  • Posts: 288
Reply 3 on: Yesterday
Gracias!

« previous next »
 

Did you know?

Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.

Did you know?

Patients who have been on total parenteral nutrition for more than a few days may need to have foods gradually reintroduced to give the digestive tract time to start working again.

Did you know?

People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.

Did you know?

Amoebae are the simplest type of protozoans, and are characterized by a feeding and dividing trophozoite stage that moves by temporary extensions called pseudopodia or false feet.

Did you know?

In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.

Surface Features on Titan Surface Features on Titan
Comparison of Ceres with the Moon and Earth Comparison of Ceres with the Moon and Earth
Earth Earth
A rubber mallet used to deliver a force to an object without harming the surface. A rubber mallet used to deliver a force to an object without harming the surface.
Earth’s Spheres Earth’s Spheres
Flow cytometry. Cells expressing the surface markers CD4, CD8, and CD3 are labeled in a direct ... Flow cytometry. Cells expressing the surface markers CD4, CD8, and CD3 are labeled in a direct ...
Video: Glomerular filtrate rate: pressures that affect GFR, NFP & GFR and blood composition

For a complete list of videos, visit our video library