atmosphere - protect layers of air around the Earth, air pressure - force of air pressing down , cold air - more dense , warm air - less dense , troposphere - where we live , stratosphere - home of ozone, greenhouse gas - Carbon dioxide , gravity - holds atmosphere together , altitude - height going up , thermal expansion - heat rises , wind - moves from high to low , ozone - 3 oxygen , conduction - heat transfer by touch,

atmosphere 7.3.1

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