atmosphere 6th
TRANSCRIPT
Atmosphere
• Mixture of gases air
Atmospheric gases (now) Percentage (%) by volume
Nitrogen 78,08
Oxygen 20,95
Argon 0,93
Carbon Dioxide 0,03
Water vapor, ozone, and othergases
0,01
Composition of the atomsphere
Early atmosphere :
More carbon dioxide and methane
Now: More oxygen
• Photosynthesis
LayersExoshere 600-
10.000 kmHydrogenand helium
- Less gasparticles
Meteorological satellites
Thermosphere 80-600 km 1500ºC -IonosphereLayer
Mesosphere 50-80 km No watervapor orozone
-100ºCLowesttemperatures
Stratosphere 15- 50 km Almost no watervapor-Ozone
-Ozone layer30 km altitud
Troposphere 0- 15 km -Oxygen-Carbondioxide-nitogenWatervapor
75% atmoshericmass
Area we liveinChanges in weather
Greenhouse effect
• Caused by :
– Water vapor
– Carbon dioxide
– Methane
–Function: retain the heat from the sun:
– average :15ºC liquid water
sustains life
Atmosphere
Greenhouse effect sustains life
Ozone layer filters UV
Maintains life oxygen / carbon dioxide
Weather water cycle