1. E
See the sentences in paragraph 1 and para.2
2. A B
See para.3: 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.
7. Not Given
See para.8: if sea ice begins to form because of a slight cooling, carbon dioxide?is locked into the ice. That weakens the greenhouse effect.
8. True
See para.9: there is no lack of such mechanisms. If you add their effects together, there is more than enough feedback to make Milankovitch work,?The problem now is identifying which mechanisms are at work. This is why scientists like Edwards are not yet ready to give up on the current theory.
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