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The amount of light penetrating the sea depends on the angle of incidence of the sun, weather conditions, and turbidity of the sea. I Like Her Bobbers – I Like His Pole shirt. Most light reflects at the surface, and red light absorbs down a few meters from the surface. Light is yellow and green penetrates deeper, and blue and violet light can descend to a depth of about 1,000 meters (3,300 ft). Not enough light for photosynthesis and plants grow at depths below 200 meters. Seawater is slightly alkaline and the pre-industrial pH is about 8.2. Recently, human activities have increased the amount of carbon dioxide in the atmosphere; about 30–40% of increased CO2 has been absorbed into the oceans, forming carbonic acid and reducing pH (currently below 8.1 [27]) through a process known as ocean acidification. [28 ] [29] [30] The pH value is expected to decrease to 7.7 (3 times the H + ion concentration) by 2100, which will be a significant change in this century.
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