Over geologic time, they have ebbed and flowed with natural climate cycles.
在整个地质时期，它们随着自然地气候循环减小或涨大。
Although rare on human timescales, over geologic time earthquakes are frequent in the area.
影响地质时期的大地震虽然在人类的历史中非常罕见，但该地区地震活动自古以来就非常频繁。
Over geologic time, increased pressure from the overlying rocks changed the layers of organic material into coal.
经历了数代地质期，上层岩石逐渐增大的压力改变了无机矿物层的构成，最终形成了煤。
Paramushir island in the northern Kurils is an example of a large island built by several volcanoes over geologic time.
千岛群岛北部的幌筵岛是在地质年代中由数座火山形成大型岛屿的一个实例。
Over geologic time the central volcano becomes extinct, followed by erosion and subsidence beneath the sea surface, leaving the coral reefs as a ring around (or cap on) the submerged island remnant.
由于侵蚀和海底的下沉，经过地质时代的变迁，中心的火山已经不见踪影，而只留下珊瑚礁环绕或覆盖在沉入海底的火山岛上。
Over geologic time the central volcano becomes extinct, followed by erosion and subsidence beneath the sea surface, leaving the coral reefs as a ring around (or cap on) the submerged island remnant.
由于侵蚀和海底的下沉，经过地质时代的变迁，中心的火山已经不见踪影，而只留下珊瑚礁环绕或覆盖在沉入海底的火山岛上。
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