1. Goal 2 – There’s gas in the air?

2. Mixture of Gases in Air All Other Gases Argon = 0.93%
Carbon Dioxide = 0.04%

3. NITROGEN A major part of proteins, including DNA
Dilutes (thins out) the oxygen – too much or too little oxygen and we would die!
Turned into useful form
by nitrogen-fixing bacteria

4. OXYGEN Necessary to survive! Our cells use oxygen to create energy
All of the oxygen in our atmosphere has been created by plants – photosynthesis!
Burning requires oxygen

5. CARBON DIOXIDE Used by plants for photosynthesis
A greenhouse gas – carbon dioxide helps keep our planet warm
Increases in CO2 have been making the planet warmer: global warming!

6. TRACE GASES OZONE helps filter out the sun’s harmful rays
ARGON is used in light bulbs because it will not catch fire even in extreme heat
WATER VAPOR can condense to form clouds
HELIUM inflates balloons and blimps