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How long does it take for an ice age to form?

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simply because it came up first in a google image search) does a nice job of highlighting this asymmetrical saw-tooth pattern Notice how the temperature slowly decreases (with lots of wiggles) going into and throughout the glacial periods, but abruptly jumps back up at the start of an interglacial. read more

The eccentricity of Earth's orbit also proceeds through a long cycle, which takes 100,000 years. Major glacial events in the Quaternary have coincided when the phases of axial tilt, precession of equinoxes and eccentricity of orbit are all lined up to give the northern hemisphere the least amount of summer insolation. read more

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