Fuels Coal (C) Gasoline (C8H16) Natural Gas (CH4) Hydrogen (H) Mostly pure carbon C + O2  CO2 Gasoline (C8H16) A mixture of hydrocarbons C8H16 + 12 O2  8 CO2 + 8 H2O Natural Gas (CH4) Hydrocarbon (methane) CH4 + 2 O2  CO2 + 2 H2O Hydrogen (H) A chemical element 2 H2 + O2  2 H2O Bad! Good! Greenhouse gases water

Snowflake Photos Courtesy of Prof. Kenneth G. Libbrecht California Institute of Technology http://snowcrystals.com

“It’s kind of funny. No two grains of sand are exactly alike, either “It’s kind of funny. No two grains of sand are exactly alike, either. But nobody cares about that.” -- Kenneth Libbrecht

Thanks to: Kenneth G. Libbrecht --Professor of Physics at Caltech --and Chairman of the Physics Department http://snowcrystals.com