1. which of the following is true about the atmosphere?

a. layer of fluids sorrounding an object

b. layer of gas surrounding the earth.

c. cloud of gas that allows up to breathe

d. layer of oxygen that surrounds the earth

2. which gas makes up 78% of the atmosphere?

a. nitrogen
b. oxygen
c. carbon dioxide
d. argon

3. what is the percentage composition of oxygen gas in the atmosphere?

4.what makes up less than 1% of the atmosphere?

a. oxygen
b. nitrogen
c. carbon dioxide
d. none of the above

5. what happens to temperature as you go higher in the troposphere?

a. it gets hotter
b. it gets colder
c. it stays the same
d. it is always changing


note: dont answer if you dont know.
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