Comets consist of "dirty ice", rather than solid rock, and so contain little iridium.
彗星是由“脏冰”所组成，而不是像小型那样由固体岩石组成，所以只含有少量的铱。
Comets are usually made of ice and rock.
彗星通常是由岩石和冰构成的。
Comets are conglomerations of ice, dust and rock from the early solar system.
彗星是早期太阳系中冰、灰尘和岩石的聚合物。
Rock debris transported and deposited by or from ice, especially by or from a glacier.
冰碛由或从冰，尤其是冰山，移动和沉积的碎屑。
Europa is fascinating, mostly silicate rock with an ice crust.
欧罗巴是迷人的，主要是硅酸盐岩石和冰壳。
There are about 98% thick continental ice sheet and 2% barren rock.
南极约98%覆盖着厚厚的大陆冰床，2%光秃的岩石。
There are about 98% thick continental ice sheet and 2% barren rock.
南极约98%覆盖着厚厚的大陆冰床，2%光秃的岩石。
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