Which atmospheric gas has increased by approximately 50 percent in the past 200 years?Multiple choice question.OxygenNitrogenCarbon dioxideChlorofluorocarbon

What greenhouse gas is the most abundant in the atmosphere?Multiple choice question.sulfur dioxidecarbon dioxidemethaneoxygen

What is the most abundant gases in the atmosphere?Group of answer choicesNitrogenCarbon dioxideHydrogenOxygen

Out of the following gases which one makes about 1/5th of the atmosphere?Group of answer choicesoxygencarbon dioxidesulfer dioxideheliumnitrogen

Multiple Choice QuestionWhat is the current trend of carbon dioxide levels in the atmosphere?Multiple choice question.CO2 levels are increasing.CO2 levels are remaining steady.CO2 levels are decreasing.

Which of the following gases is the most abundant in the air we breathe?Group of answer choicesWater VaporArgonNitrogenOxygen