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CHALLENGE:Answer all 5 review questions correctly to receive the code. If you don't get them all correct,you can try again!

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Nitrogen

Argon

Oxygen

Carbon Dioxide

Question 1 of 5

What is the most abundant gas in Earth's atmosphere?

Nitrogen

Argon

Oxygen

Carbon Dioxide

Question 1 of 5

What is the most abundant gas in Earth's atmosphere?

Question 2 of 5

About what percentage of Earth's atmosphere is made up of nitrogen?

78%

21%

Less than 1%

50%

Question 2 of 5

About what percentage of Earth's atmosphere is made up of nitrogen?

78%

21%

Less than 1%

50%

Question 3 of 5

Which model below represents the second most abundant gas in Earth's atmosphere?

Question 3 of 5

Which model below represents the second most abundant gas in Earth's atmosphere?

Question 4 of 5

Which model below represents the third most abundant gas in Earth's atmosphere

Question 4 of 5

Which model below represents the third most abundant gas in Earth's atmosphere

78%

21%

Much less than 1%

50%

Question 5 of 5

What percentage of Earth's atmosphere is made up of carbon dioxide gas?

Question 5 of 5

78%

21%

Much less than 1%

50%

What percentage of Earth's atmosphere is made up of carbon dioxide gas?

The code is:9876

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