The pressure of the Earth’s atmosphere at sea level is due to the ……
A. gravitational attraction of the Earth for the atmosphere
B. evaporation of water from the seas and oceans
C. fact that most living things constantly breathe air
D. heating of the atmosphere by the Sun
Answer:A
The pressure of the Earth’s atmosphere at sea level is due to the ……
A. gravitational attraction of the Earth for the atmosphere B. evaporation of water from the seas and oceans C. fact that most living things constantly breathe air D. heating of the atmosphere by the Sun