Multiple Choice
The most abundant gases in the earth's present day atmosphere (by volume) are ____.
A) carbon dioxide and nitrogen
B) oxygen and water vapor
C) nitrogen and oxygen
D) oxygen and helium
Correct Answer:
Verified
Correct Answer:
Verified
Related Questions
Q13: Molecular oxygen (O<sub>2</sub>) in the earth's early
Q14: Plant photosynthesis increased the concentration of _
Q15: The word "weather" is defined as_.<br>A) the
Q16: Instructions: Choose one answer from each pair
Q17: Explain why oxygen-breathing equipment would be needed
Q19: Instructions: Choose one answer from each pair
Q20: Areas of high atmospheric pressure are also
Q21: Which gases in the upper atmosphere shields
Q22: You are facing north and the wind
Q23: The "ozone hole" is observed above _.<br>A)