Geography · Atmosphere and Environment

Identify the CORRECT statement(s) about the Earth's atmosphere: A. The troposphere contains about 75-80% of the atmosphere's mass and almost all the water vapor, which is why most weather occurs there. B. Methane is a more potent greenhouse gas than CO2 molecule-for-molecule but is present in smaller atmospheric amounts. C. Volcanic sulfur dioxide forms sulfate aerosols in the troposphere that permanently warm the Earth. D. The majority of atmospheric nitrogen is biologically active and can be absorbed directly by most plants without conversion.