1) A mixture of gases that surrounds a planet or moon a) stinky b) atmosphere c) ozone 2) The height above sea level a) density b) mass c) altitude 3) How tightly packed together molecules are in a given space a) mass b) density c) pressure 4) The most common gas in the atmosphere (78%) is? a) nitrogen b) oxygen c) carbon dioxide 5) As altitude increases, the density of each layer a) decreases b) increases c) stays the same 6) This layer is the least dense of all the layers a) troposphere b) mesophere c) exosphere 7) Which layer of the atmosphere is the most dense? a) troposphere b) mesophere c) thermosphere 8) The troposphere is the densest layer of the atmosphere because of a) living organisms b) gravity c) pollution 9) The force of air pressing against objects is a) density b) gravity c) air pressure 10) This is the second most abundant (plentiful) gas in the atmosphere (21%) a) nitrogen b) oxygen c) helium

What's in the Atmosphere?

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