Question

lesson 29 - the atmosphere
atmospheric pressure.....
□ is greater at lower elevations
□ is caused by the collisions of particles exerting a force per unit area
□ is caused by the weight of air above
□ is greater at higher elevations

Explanation:

Atmospheric pressure depends on the weight of air above a point. Lower elevations have more air above, so pressure is greater there. It is not caused by particle collisions (that's gas pressure in a container, not atmospheric pressure's primary cause), and higher elevations have less air above, so lower pressure.

Answer:

is greater at lower elevations, is caused by the weight of air above