冰山(Icebergs)英语作文

icebergs are among nature＇s most spectacular creations, and yet mostpeople have never seen one. a vague air of mystery envelops them. theycome into being ----- somewhere ------in faraway, frigid waters, amidthunderous noise and splashing turbulence, which in most cases no onehears or sees. they exist only a short time and then slowly waste awayjust as unnoticed.

objects of sheerest beauty they have beencalled. appearing in an endless variety of shapes, they may bedazzlingly white, or they may be glassy blue, green or purple, tintedfaintly of in darker hues. they are graceful, stately, inspiring -----in calm, sunlight seas.but they are also called frightening anddangerous, and that they are ---- in the night, in the fog, and instorms. even in clear weather one is wise to stay a safe distance awayfrom them. most of their bulk is hidden below the water, so theirunderwater parts may extend out far beyond the visible top. also, theymay roll over unexpectedly, churning the waters around them.

icebergsare parts of glaciers that break off, drift into the water, float aboutawhile, and finally melt. icebergs afloat today are made of snowflakesthat have fallen over long ages of time. they embody snows that drifteddown hundreds, or many thousands, or in some cases maybe a millionyears ago. the snows fell in polar regions and on cold mountains, wherethey melted only a little or not at all, and so collected to greatdepths over the years and centuries.

as each year＇s snowaccumulation lay on the surface, evaporation and melting caused thesnowflakes slowly to lose their feathery points and become tiny grainsof ice. when new snow fell on top of the old, it too turned to icygrains. so blankets of snow and ice grains mounted layer upon layer andwere of such great thickness that the weight of the upper layerscompressed the lower ones. with time and pressure from above, the manysmall ice grains joined and changed to larger crystals, and eventuallythe deeper crystals merged into a solid mass of ice.

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