Icebergs are parts of glaciers that break off, drift into the water, float about awhile, 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 surface, 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.
46.The underlined word "dazzlingly" in Paragraph 2 probably means " ".
A.brilliantly B.abundantly C.beautifully D.approximately
47.The author states that icebergs are rarely seen because they are .
A.broken by waves soon after they are found
B.hidden under the mountains
C.located in remote regions of the world
D.surrounded by fog
48.The underlined phrase "from above" in the last paragraph refers to " ".
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