[ 29 ] Earth and Space Science GED ® TEST SCIENCE FLASH REVIEW • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • Place the following gases that exist in Earth’s atmosphere in order of greatest to least amounts: • oxygen • nitrogen • water vapor • small amount of other gases Place the following layers of the atmosphere in order from farthest to closest to the planet’s surface: • troposphere • mesosphere • thermosphere • stratosphere What is the general order in which the following processes occur? • evaporation of water • precipitation • condensation into clouds