Answer keys and explanations:
1.E
See the sentences in paragraph 1(Theres a dimmer switch inside the sun that causes its brightness to rise and fall on timescales of around 100,000 years - exactly the same period as between ice ages on Earth.So says a physicist who has created a computer model of our stars core.) and para.2 (Robert Ehrlich of George Mason University in Fairfax, Virginia, modelled the effect of temperature fluctuations in the suns interior.)
2.A B
See para.3:?i style=mso-bidi-font-style:normal》Grandpierre and a collaborator, Gbor goston, calculated that magnetic fields in the suns core could produce small instabilities in the solar plasma.
3.C
See para.8:Edwards believes the small changes in solar heating produced by Milankovitch cycles are then amplified by feedback mechanisms on Earth.
4.D
See para.11:Nigel Weiss, a solar physicist at the University of Cambridge, is far from convinced.He describes Ehrlichs claims as utterly implausible.
5.False
See para.5:for the past million years, ice ages have occurred roughly every 100,000 years.Before that, they occurred roughly every 41,000 years.
6.False
See para.7:In Milankovitch, there is certainly no good idea why the frequency should change from one to another, ...Nor is the transition problem the only one the Milankovitch theory faces.
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