They have been called objects of complete beauty. Appearing in an endless variety of shapes, they may be dazzlingly white, or they may be glassy blue, green or purple, in light colors or in dark colors. They are graceful, stately, inspiringly calm, sunlit seas.

　　But they are also called frightening and dangerous, and that they are in the night, in the fog, and in storms. Even in clear weather one is wise to stay a safe distance away from them. Most of their main part is hidden below the water, so their underwater parts may extend out far beyond the visible top. Also, they may roll over unexpectedly, stirring the waters around them.

　　Icebergs are parts of glaciers that break off, drift into the water, float about a while, and finally melt. Icebergs floating today are made of snows that have fallen over long ages of time. They include snows that drifted down hundreds, or many thousands; or in some cases maybe a million years ago. The snows fell in Polar regions and on cold mountains, where they melted only a little or not at all, and so collected to great depths over the years and centuries.

　　As each year's snow accumulation lay on the surfaces, evaporation and melting caused the snowflakes slowly to become tiny grains of ice. When new snow fell on top of the old, it too turned to 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 pressed 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. 16．The underlined word “dazzlingly” in Paragraph 2 probably

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