Interactions and Impacts of Oceans

May 13th, 2015
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The ocean is an important part of the earth system and it influences the transformation of energy and materials to the climate system, but can be affected in different ways on all spheres.

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ASSIGNMENT IN EARTH SCIENCE.ZYRENE DIONICIOWhy is the sky blue?A clear cloudless day-time sky is blue because molecules in the air scatter blue light fromthe sun more than they scatter red light. When we look towards the sun at sunset, we seered and orange colours because the blue light has been scattered out and away from theline of sight.The white light from the sun is a mixture of all colours of the rainbow. This wasdemonstrated by Isaac Newton, who used a prism to separate the different colours and soform a spectrum. The colours of light are distinguished by their differentwavelengths. The visible part of the spectrum ranges from red light with a wavelength ofabout 720 nm, to violet with a wavelength of about 380 nm, with orange, yellow, green,blue and indigo between. The three different types of colour receptors in the retina of thehuman eye respond most strongly to red, green and blue wavelengths, giving us ourcolour vision.Tyndall EffectThe first steps towards correctly explaining the colour of the sky were taken by JohnTyndall in 1859. He discovered that when light passes through a clear fluid holdingsmall particles in suspension, the shorter blue wavelengths are scattered more stronglythan the red. This can be demonstrated by shining a beam of white light through a tankof water with a little milk or soap mixed in. From the side, the beam can be seen by theblue light it scatters; but the light seen directly from the end is reddened af

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