The Atmosphere Processes in the Hydrologic Cycle: Convert To Process Water Vapor evaporation Water vapor Water condensation Ice Water melting Water Ice freezing Vapor Ice deposition Ice Vapor sublimation The Hydrologic Cycle The Carbon Cycle The Carbon Cycle Greenhouse Effect & Global Warming • The atmosphere is transparent to sunlight. • Light hits the surface and is converted into heat. • Greenhouse gasses (CO2, H2O, and others) trap heat not allowing it to escape back into outer space. • Humans may be increasing the amount of CO2 in the atmosphere by burning fossil fuels, and thus causing global warming The ozone problems • • • • • • Ozone is O3 = three atoms of oxygen bonded into a molecule. Ozone is made by motors and engines as a pollutant. Ozone is very reactive! Ozone irritates your eyes, lungs, etc. Ozone is BAD at the Earth’s surface where people live. Ozone is made in the upper atmosphere when radiation from the Sun hits oxygen molecules. • Ozone acts like sunscreen and blocks harmful ultraviolet radiation. • Ozone is good in the upper atmosphere. • CFC’s like Freon destroy ozone in the upper atmosphere!