As each years snow accumulation lay on the surface,evaporation and melting caused the snowflakes slowly to lose their feathery points and become tiny grains of ice.When new snow fell on top of the old,it too turned into icy grains.So blankets of snow and ice grains mounted layer upon layer and were of such great thickness that the weight of the upper layers compressed the lower ones.With time and pressure from above,the many small ice grains joined and changed to larger crystals,and eventually the deeper crystals merged into a solid mass of ice.
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冰山是大自然最壮观的杰作之一,而大多数人却从未见过。它们被一层神秘的面纱所笼罩。冰山产生于某些遥远的冰冷水域中,生成时发出雷鸣般的响声,溅起巨浪,而在多数情况下没人听到或见过。它们昙花一现并渐渐消失无踪。
它们被誉为最美丽的物体。其形状变化多端,呈现出耀眼的白色或透亮的蓝色、绿色或紫色,带着丝丝淡淡的深色。在风平浪静、洒满阳光的海面上,它们是那么优雅、宏伟、激动人心。
然而在夜晚、在雾里以及在风雨中,它们也被认为是可怕和危险的,即使是在天气晴朗的日子,与其保持安全的距离也是明智之举。冰山的大部分体积都隐藏在水下,因此它们水下的部分远比水上可见的部分大。它们还可能会出乎意料地滚动,引起周围水域的剧烈翻腾。
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