Why does atmospheric pressure taken at a weather station need to be adjusted to sea level pressure before it can be compared with the pressure at other stations?

If Earth were in a warming trend, which of the processes below would most likely act as a negative feedback mechanism?

All the following are examples of atmosphere-ocean interactions except:

Closely-spaced isobars on a map indicate:

All the following are things that cause climate changes from natural events, except:

When it is March and spring in the Northern Hemisphere, it is __________ and ___________ in the Southern Hemisphere.

What force causes surface winds to blow across isobars, unlike at upper levels?

A pressure gradient is which of the following?

The following are all types of air masses except:

The Earth is closest to the Sun in: