SCIENCE
EARTH SCIENCE
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
78%
|
|
|
21%
|
|
|
0.8%
|
|
|
0.2%
|
Detailed explanation-1: -According to NASA, the gases in Earth’s atmosphere include: Nitrogen-78 percent. Oxygen-21 percent. Argon-0.93 percent. Was this answer helpful?
Detailed explanation-2: -It’s a mixture of different gases. The air in Earth’s atmosphere is made up of approximately 78 percent nitrogen and 21 percent oxygen.
Detailed explanation-3: -So how did Earth end up with an atmosphere made up of roughly 21 percent of the stuff? The answer is tiny organisms known as cyanobacteria, or blue-green algae. These microbes conduct photosynthesis: using sunshine, water and carbon dioxide to produce carbohydrates and, yes, oxygen.
Detailed explanation-4: -Atmosphere is the layer of gases surrounding the planet. The major gases present in atmosphere are nitrogen, oxygen, argon, carbon dioxide and other gases in minute quantity. The percentage of oxygen present in atmosphere is 21.
Detailed explanation-5: -By around 600 million years ago, concentrations of molecular oxygen in our atmosphere finally reached around 21 percent.