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What is the third by volume, after nitrogen and oxygen, component of dry air?

carbon dioxide
methane
ozone
argon
Argon makes up 0.934% of the earth's atmosphere. It is more than twice as abundant as water vapor and 23 times as abundant as carbon dioxide.
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Answers by country

carbon dioxide
methane
ozone
argon
answers
flagAustralia
36%
5%
10%
47%
19
flagthe United States
28%
15%
12%
43%
90
flagSwitzerland
35%
7%
14%
42%
14
flagGreece
40%
6%
13%
40%
15
flagthe United Kingdom
45%
8%
13%
32%
46
flagNigeria
50%
0%
14%
32%
34
flagIndia
44%
10%
14%
30%
142
flagthe Philippines
30%
20%
20%
30%
10
flagAustria
47%
0%
23%
29%
17
flagPoland
50%
3%
18%
26%
4435
flagPakistan
33%
16%
16%
25%
12
flagGermany
45%
9%
22%
20%
140

The bright circle around the Sun seen in the picture is known as a halo. What causes it?

refraction of light in ice crystals
refraction in the lens of the eye or lens
refraction of light in water drops
reflections from the water surface

Why is the ozone hole dangerous?

it speeds up the global warming
it increases UV radiation
it depletes the oxygen (O2)
it disturbs Earth's magnetic field

In which layer of the atmosphere the aurora is created?

In the Troposphere
In the Stratosphere
In the mesosphere
In the Thermosphere

What do red-white stripes on the USA flag symbolize?

the alliance of Whites and Native Americans
blood spilled for liberty
fight (red) and faith (white)
thirteen primary colonies