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air pressure amount aquarium atmosphere atoms balloon bottle candle carbon dioxide caused changes chemical Chicago Teachers College chlorophyll cloth coal color Compare CONSERVATION INTERRELATIONSHIPS container cover crops Demonstration—Place earth earth's surface electricity elements erosion evaporation Explain fibers fish forecasts forest fossil fossil fuels fuels gallons Geotropic glass jar grass grow growth heat hole ice cubes inch increase industrial Investigate irrigation isotopes land layers leaf light limestone living things Locate man's materials Materials—Two metal natural resources needs nuclear energy nuclear fusion Observe ocean outer space oxygen paper particles piece plants and animals plastic pollution problems produce radiant energy radioactive recreation Remove require samples sand Science seeds soil solar streams subsoil substances sun's sunlight synthetic temperature terrarium tion topsoil trees tube United water cycle water levels water pollution water supply watershed weather Wildlife wind