- and it covers nearly 10 percent of the earth's surface.
它覆盖了地球表面将近10%的面积
- Limestone is composed of minerals derived from marine shells and corals,
石灰岩由海螺和 珊瑚中的矿物沉积后形成
- so although this rocky escarpment in the United States is now hundreds of metres above sea level
所以 尽管美国境内的这座石壁 如今矗立在海平面以上几百米高的地方
- it was actually formed under water.
它实际上却是在水下形成的
- The limestone towers of Vietnam's Ha Long Bay
越南下龙湾的石林
- are a reminder of this link with the sea.
能说明石灰岩与海洋的关系
- Originally, this whole area would have been one solid block of limestone,
起初 这整个地方都是 一整块坚固的石灰岩床
来自《行星地球 第一季 第四集 Planet Earth S01E04 洞穴》第 47 行