9. True
See the sentences in para.9 and para.10 .
10. constant
See para.2: According to the standard view, the temperature of the suns core is held constant by the opposing pressures of gravity and nuclear fusion.
11. orbit
See para.6: Most scientists believe that the ice ages are the result of subtle changes in Earths orbit, 匛arths orbit gradually changes shape from a circle to a slight ellipse and back again roughly every 100,000 years.
12. instabilities
See para.3: ?i style=mso-bidi-font-style:normalmagnetic fields in the suns core could produce small instabilities in the solar plasma. These instabilities would induce localised oscillations in temperature.
13. cycles
See para.4: allow the suns core temperature to oscillate around its average temperature of 13.6 million kelvin in cycles lasting either 100,000 or 41,000 years.
14. random
See para.4: Ehrlich says that random interactions within the suns magnetic field could flip the fluctuations from one cycle length to the other.
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