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.
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。
Apatosaurus could live in lakes or swamps, but mostly lived on dry land.
迷惑龙能生活在湖里或沼泽地中，但大部分时间都住在陆地上。
Apatosaurus could live in lakes or swamps, but mostly lived on dry land.
迷惑龙能生活在湖里或沼泽地中，但大部分时间都住在陆地上。
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