OZ 1- Whats In The Air Flashcards
1
Q
What is name of atmospheric layer closest to earth’s surface?
A
Troposphere
2
Q
Which layer in atmosphere has a reverse temperature gradient?
A
2nd layer, stratosphere
3
Q
What gases did the early atmosphere contain and why did this change?
A
- CO2, methane, ammonia
- CO2 supported plant life, photosynthesis increased conc of O2, til it balanced out at 21%
4
Q
What is % composition of nitrogen in atmosphere?
A
78%
5
Q
Define atmospheric pollutant
A
- gases added to atmosphere, or concentrations of gases are altered by human activity
6
Q
How do you convert from ppm to percentage composition?
A
Divide by 10,000
7
Q
How do you convert from percentage composition to ppm?
A
Times by 10,000
