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  3. The blue of the sea is caused by the scattering of sunlight by tiny particles suspended in the water. Blue light, being of short

The blue of the sea is caused by the scattering of sunlight by tiny particles suspended in the water. Blue light, being of short

admin2006-07-14  75
问题     The blue of the sea is caused by the scattering of sunlight by tiny particles suspended in the water. Blue light, being of short wavelength, is scattered more efficiently than light of longer wavelengths. Although waters of the open ocean are commonly some shade of blue, green water is commonly seen near coasts, especially in tropical or subtropical regions. This is caused by yellow pigments being mixed with blue water. Phytoplankton are one source of the yellow pigment. Other microscopic plants may color the water brown or brownish-red. Near the shore, silt or sediment in suspension can give water a brownish hue. Outflow of large rivers can often be observed many miles offshore by the coloration of suspended soil particles.
    Marine phytoplankton (Greek for "plant wanderers") are microscopic single-celled plants that include diatoms, dinoflagellates, coccolithophorids, green algae, and blue-green algae, among others. The growth of these organisms, which photosynthesize light, depends on a delicate balance of nutrient enrichment via vertical mixing, which is often limited by the availability of nitrogen and light. Diatoms are one-celled plants with patterned glass coverings. Each glass, or silicon dioxide box, is ornamented with species-specific designs, pits, and perforations making them popular with microscopists and, more recently, electron scanning microscopists.
What can give waters a brownish hue near the shore?
选项 A、Sediment.
B、Phytoplankton.
C、Blue pigment.
D、Diatoms.
答案A
解析 见文章第一段倒数第二句：Near the shore，silt or sediment in suspension can give water a brownish hue．靠近岸边的地方，水中悬浮的淤泥和沉淀物使得海水呈褐色。选项A正确。
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