1. Which layer of the atmosphere does the air constantly moving?
a. mesosphere
b. thermosphere
c. exosphere
d. troposphere
2. How many percent of oxygen does the atmosphere contains?
a.78 96
b.6096
c. 25%
d. 21%
3. Which layer of the atmosphere has very thin and cold air?
a. mesosphere b. thermosphere
c. exosphere
d. troposphere
4. Which of the following element is the most abundant in the Earth's atmosphere?
a. Argon
b. Carbon dioxide
c. Nitrogen
d. Oxygen
the imnosphere essential?​