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  3. 學習啦>學習方法>各學科學習方法>閱讀答案>《南極冰川下的火山閱讀題答案》正文

    南極冰川下的火山閱讀題答案

    時間:2015-10-12 16:04:09本文內容及圖片來源于讀者投稿,如有侵權請聯系xuexila888@qq.com 淑航 我要投稿

      南極厚厚的冰層下曾經有過火山爆發的“冰火兩重天”奇觀。下面是學習啦小編收集整理的《南極冰川下的火山》的閱讀題目及其參考答案以供大家學習。
     

      《南極冰川下的火山》閱讀原文:

     、2200多年前的某一天,南極的動物們原本正在像平時一樣過著自己悠閑的日子,突然,它們感到腳下的冰面開始劇烈震動,隨后它們看到了令自己永生難忘的一幕壯麗奇觀――原本平坦結實的冰層中,出現了一個巨大的坑洞,夾雜著非比尋常熱度的煙霧從坑洞中滾滾而出,垂直地噴向高空,遠遠望去,就像是一個不斷翻滾的高達12千米的煙柱。

     、谶z憾的是,這次煙柱奇觀并沒有持續多久,隨著煙霧的消散,冰雪很快將坑洞覆蓋,在低溫的幫助下,南極又恢復了往日的樣子。

     、圻@是英國南極考察隊2008年在南極進行考察后,描繪出的一幅令人難以置信的畫面。當時,科考隊員在空中使用雷達對南極大陸冰層下的地形進行探測時,發現西部冰原的哈德孫山冰層下有一塊2.3萬平方千米的“特殊”區域,其地形極不規則。經科考隊員確認,其冰層下面矗立著一座海拔約1000米的巖石山,而根據其周圍的沉積物等情況判斷,這座火山曾在約2200年前爆發過。

     、苣蠘O厚厚的冰層下曾經有過火山爆發的“冰火兩重天”奇觀,想想就令人興奮不已。但是科學家們卻開始憂心忡忡,既然南極冰層下確實有不少火山甚至活火山,歷史上還曾經爆發過若干次,那有沒有可能南極冰層下仍然存在著隨時可能爆發的活火山?如果有的話,一旦火山爆發,會出現怎么樣的情況呢?

     、萦行┤碎_始坐立不安了,他們甚至悲觀地認為,一旦火山爆發,巖漿會融化大量的冰川,導致海平面急劇升高,淹沒毫無準備的人類城市,無數人將流離失所,為了生存不得不長途遷徙……

     、奕绻阋蚕氲搅诉@些凄慘的畫面,趕快打住吧!南極冰蓋的厚度,不是一般性的火山爆發能頂開的,火山很有可能讓冰層一陣晃動之后就自動平息了;如果火山爆發比較厲害,就像是2200年前那次爆發,那么其情景也不過是和當時差不多,雖然肯定會有一些冰層融化進入海洋,但是影響時間并不會太長久;假如真的發生了讓人難以想象的、劇烈且成串的火山活動,導致南極大量冰層融化,全球海平面也升高不了幾厘米,再說,全球的水循環是一個完整的系統,有冰的融化,自然也會有水的凝結,兩者之間也多少可以相互抵消一些。

     、吣壳翱磥,冰層下的火山活動中心距離冰面至少有1千米,想要將1千米的冰層融化可是個大工程。因此,為南極冰層下的火山爆發而緊張完全是杞人憂天了。

      (選自2014年2期《大科技・百科新說》,有刪節)

     

      《南極冰川下的火山》閱讀題目:

      1.選文的說明對象是_____________________________________。

      2.為什么說為南極冰層下的火山爆發而緊張是“杞人憂天”?請說明理由。

      3.選文第⑦段加著重號的詞“至少”能否刪去?請說明理由。

      4.選文體現了怎樣的科學思想?

     

      《南極冰川下的火山》閱讀答案:

      1.南極冰川下的火山

      2.①南極冰蓋的厚度,不是一般性的火山爆發能頂開的;②如果火山爆發較厲害,會有一些冰層融化進入海洋,但是影響時間并不會太長久;③假如發生了劇烈且成串的火山活動,導致南極大量冰層融化,全球海平面也升高不了幾厘米;④全球水循環是一個完整系統,有冰的融化,自然會有水的凝結,兩者之間可以相互抵消一些。

      3.不能刪去。“至少”表最低限度,說明火山活動中心距離冰面最低限度有1千米,甚至更大,如果刪去,就變成“火山活動中心距離冰面有1千米”了,與文中表述不符。“至少”體現出了說明文語言的準確性、科學性特點。

      4.示例:多元思考的科學思想;證實加證偽的科學思想。

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