Researchers have thrown up different figures for how much, and how fast, Greenland is shedding its icy mantle, which is up to three kilometres (1.7 miles) thick in places.
2
她证明了土星的潮汐力强度能够满足将冰质幔层剥离而不伤害到硅酸盐核心的条件。
She demonstrates that the planet's tidal forces can indeed be strong enough to take water ice away from the satellite, but not to tear its dense silicate core.
3
拥有硅酸盐金属核心与冰质幔层的大量已分化小行星是最佳选择。
A large, differentiated satellite - with a core composed of silicates and iron, and a lighter mantle made of water ice - would be a good choice.
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