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.
【雅思阅读实战训练模拟试题(八)】相关文章:
★ 雅思阅读的考点词
最新
2016-02-26
2016-02-26
2016-02-26
2016-02-26
2016-02-26
2016-02-26