Multiple Choice QuestionGreenhouse gases make up Blank______% of the atmosphere.Multiple choice question.more than 10<0.1about 5

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

Multiple Choice QuestionWhat phrase best describes the relative amount of greenhouse gases (%) in the atmosphere?Multiple choice question.HighLowModerate

Our atmosphere plays a Blank______ part in the nitrogen cycle, as nitrogen gas (N2) makes up about Blank______ percent of our atmosphere.Multiple choice question.very minimal; 0.001key; 78small; 12

Multiple Choice QuestionAmbient air is Blank______.Multiple choice question.an air mass at room temperaturethe air around usthe average composition of a planet's airair devoid of pollutants

Multiple Choice QuestionBurning natural gas produces about Blank______ the amount of CO2 (a greenhouse gas) as an equivalent amount of coal.Multiple choice question.halfdoubletriple