The march of the seasons imparts a rythm to life on Earth.Over much of the world , climates swings like a pendulum between summer and winter.Even in the tropics,
where the weather is warm year 'round, rainy seasons, known as MONSOONS, alternate with dry seasons and each has its own distinct pattern of prevailling winds.
To make its way in the world the human race has learned to adapt to the changing seasons. Year after year, people have sown and harvested corps,bred livestock, deployed fishing vessels, and planned hunting expeditions according to a well-defined series of calender dates.
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