Which of the following is true about air pressure acting on an object?

a. the amount pushing down on the object will gradually decrease with time
b. the amount pushing up on the object will gradually increase with time
c. there is more air pressure pushing up on the object than there is pushing down
d. there is just as much air pressure pushing up as there is pushing down on the object

Global warming will produce rising sea levels partly due to melting ice caps but also due to the expansion of water as average ocean temperatures rise. to get some idea of the size of this effect, calculate the change in length (in m) of a column of water 1.45 km high for a temperature increase of 1.12°c. assume the column is not free to expand sideways. as a model of the ocean, that is a reasonable approximation, as only parts of the ocean very close to