L ' Earth's atmosphere is the envelope of gas that covers the planet Earth . It has a complex structure is divided in several layers, which are in order of height: troposphere, stratosphere , mesosphere, ionosphere , exosphere , and its chemical composition media the ground is the following:
- Nitrogen (N 2 ): 78.08%
- Oxygen (O 2): 20.95%
- Argon (Ar): 0.93%
- water vapor (H 2 O ): 0.33% on average (ranging from approximately 0% to 5-6%)
- Carbon dioxide (CO 2 ): 0.032% (320 ppm)
- Neon (Ne): 0.00181% (18 ppm)
- Helium (He): 0.0005% (5 ppm)
- Metano (CH 4 ): 0,0002% (2 ppm)
- Idrogeno (H 2 ): 0,00005% (0,5 ppm)
- Kripton (Kr): 0,000011% (0,11 ppm)
- Xeno (Xe): 0,000008% (0,08 ppm)
- Ozono (O 3 ): 0,000004% (0,04 ppm)
are also present in traces Nitrogen oxides (NO, NO 2 , N 2 O), carbon monoxide (CO), Ammonia (NH 3 ) sulfur dioxide (SO 2 ) Hydrogen sulphide (H 2 S).
Matina John
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