Question
how many of earth's atmospheres is on you at sea level?
Answers
Ms. Sue
http://csep10.phys.utk.edu/astr161/lect/earth/atmosphere.html
Rosy
is it possible to give a number answer?
Ms. Sue
Yes. See the map in the link above. Count the layers over the earth.
Rosy
is it 4?
Ms. Sue
Yes. :-)