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Scientists have long studied how ____________ in Earth's orbit relate to ice ages, cycles of glacier building and retreat, and even mass ____________ New research has uncovered some surprising ____________ among all these things. About 23 ____________ years ____________ a huge ice sheet spread over Antarctica, temporarily reversing a general trend of global warming, decreasing ice volume and ushering in a generally calm climatic period. The new study suggests ____________ period corresponded with a ____________ ____________ of events in the pattern of ____________ trek around the ____________ The idea that cyclical variations in Earth's orbit can cause major climate changes was first proposed by astrophysicist Milutin Milankovitch. The main variables are eccentricity, obliquity and ____________ Eccentricity refers to the changing shape of Earth's orbit around the Sun, ____________ varies from ____________ circular to elliptical over a cycle of about 100,000 years. Obliquity refers ____________ the angle at ____________ Earth's ____________ is tilted ____________ respect to the plane of its orbit, varying between 22.1 degrees and 24.5 degrees over a 41,000-year cycle. Precession is the gradual ____________ in the direction Earth's axis is pointing, a 21,000-year cycle ____________ ____________ the axis carves out an imaginary cone shape.
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