琥珀色大理石地砖和地面边缘的黑色玄武岩，仿佛在提醒人们这里曾是皇宫。
On all sides, toweringbookcases burgeoned with volumes. The floor was amber marble with black basalt trim, ahandsome reminder that this building had once been a palace.
在这幅图像中黑色玄武岩沙带被从冰层下面显露出来，在季节性冰盖的顶部形成扇形堆积。
In this image streaks of dark basaltic sand have been carried frombelow the ice layer to form fan-shaped deposits on top of the seasonalice.
陆地地壳主要由花岗岩和其它轻质硅酸盐矿物构成，而海底则主要由黑色的高密度火山岩——玄武岩构成。
The dry land of the continents consists mostly of granite and other light silicate minerals, while the ocean floors are made up mostly of a dark, dense volcanic rock called basalt.
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