Weather: A Guide to Earth's Weather and Climate - Maria Constantino
An air mass is a body of air that covers most of a continent or ocean and has uniform characteristics that it acquires from the Earth's surface below. Air over a continental land mass will be drier than air over the ocean, and it will be warmer in the summer and cooler in the winter because of the different rates at which the land and the sea warm up and cool down. Once it has taken on these characteristics, the body of air becomes an air mass.
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