推 mde:感謝 !!了解了 09/07 09:14
※ 引述《mde (bnbnbn)》之銘言：
: A green iceberg that stranded just west of the Amery Ice Shelf
: showed two distinct layers: bubbly blue-white ice and bubble-free green ice
: separated by a one-meter-long ice layer containing sediments. The green ice
: portion was textured by seawater erosion. Where cracks were present, the
: color was light green because of light scattering; where no cracks were
: present,the color was dark green. No air bubbles were present in the green ice,
: suggesting that the ice was not formed from the compression of snow
: but instead from the freezing of seawater. Large concentrations of
: single-celled organisms with green pigments(coloring substances) occur
: along the edges of the ice shelves in this region,and the seawater is rich in
: their decomposing organic material.The green iceberg did not contain large
: amounts of particles from these organisms, but the ice had accumulated
: dissolved organic matter from the seawater.
: It appears that unlike salt,dissolved organic substances are not excluded
: from the ice in the freezing process. Analysis shows that the dissolved
: organic material absorbs enough blue wavelengths from solar light to make the
: ice appear green.
: 7. Why does the author mention that “The green ice portion was
: textured by seawater
: erosion”?
: ○ To explain why cracks in the iceberg appeared light green instead of dark
: green
: ○ To suggest that green ice is more easily eroded by seawater than white ice
: is
: ○ To support the idea that the green ice had been the bottom layer before
: capsizing
: ○ To explain how the air bubbles had been removed from the green ice
: 請教戰友們 此題中C選要如何找到對應的選擇
: 想破頭還是不知道 海水侵蝕造成的綠色部分 跟3選 的關聯處
: ...我只能用刪去法把1,2,4都槓掉 冏
: 謝謝大家的回答 感謝!
文章說到 綠色冰山在分裂出來變成冰山前 是在冰層裡的底層處
所以這裡作者說green ice was textured by seawater 也就是證明了這個事實
因為只有在底層的部分才會浸在海水中受到海水作用(C選項的意思) 所以選C
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