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A circular orbit causes a decrease in seasonality – mild winters and cool summers. Not all of the snow melts in the summer, so this orbit produces glacial conditions.
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An elliptical orbit causes an increase in seasonality – cold winters and hot summers. Snow melts in the warm summer, so this orbit produces interglacial conditions.
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At maximum tilt (24.5°), polar areas receive more sunlight during the summer. This causes melting of ice and produces interglacial conditions.
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A minimum tilt (22.1°), polar areas receive less sunlight during the summer. This causes an expansion of ice and produces glacial conditions.
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