Question

which are the two major greenhouse gases?

a. o₂ and h₂o

b. ch₂o and co

c. no and no₂

d. co₂ and ch₄

Explanation:

To determine the two major greenhouse gases, we analyze each option:

• Option A: \(O_2\) (oxygen) is not a greenhouse gas, and while \(H_2O\) (water vapor) is a greenhouse gas, \(O_2\) is not, so A is incorrect.
• Option B: \(CH_2O\) (formaldehyde) and \(CO\) (carbon monoxide) are not the major greenhouse gases, so B is incorrect.
• Option C: \(NO\) (nitric oxide) and \(NO_2\) (nitrogen dioxide) are pollutants and not the major greenhouse gases, so C is incorrect.
• Option D: \(CO_2\) (carbon dioxide) and \(CH_4\) (methane) are well - known as the two major greenhouse gases, contributing significantly to the greenhouse effect.

Answer:

D. \(CO_2\) and \(CH_4\)