Earth's crust is Earth's hard outer layer. It is less than 1% of Earth's volume. The crust is made up of different types of rocks: igneous, metamorphic, and sedimentary rocks.
地壳 是 地球 坚硬的 外层。它 不到 地球体积的 1％。地壳 由 不同类型的 岩石 组成：火成岩，变质岩 和 沉积岩。
