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air pressure airplane amount atmospheric space atoms balloon bottle burning candle carbon dioxide caused changes chemical cloth clouds color Compare CONSERVATION INTERRELATIONSHIPS cooling cover crops Demonstration—Place droplets dust earth's atmosphere earth's surface electricity erosion evaporation exosphere Explain fish forest fossil fossil fuels fuels gallons gases glass jar grass heat hole ice cubes inch industrial Investigate irrigation jet stream land layers leaf light List living things Locate man's materials Materials—Two mineral move natural needs nuclear fusion observe occupy space ocean outer space oxygen paper particles piece plants and animals pollution problems produce radiant energy rain recreation Remove require rockets rocks sand seeds sheet solar system streams subsoil sun's sunlight synthetic temperature terrarium thunderstorm tion topsoil tornado trees United warm water cycle water level water vapor watershed weather forecasts Wildlife wind direction wpaw