Why is the sea blue? and the sky for that matter?
357291
the sea and sky is blue because of light refraction\n\nthe sea absorbs the longer wavelenghts of light which are near the red end of the visible spectrum, and reflects blue to our eyes which we see. \n\nthe sky reflects all of the light waves in the particles in the sky, water, CO2, Hydrogen, etc., and as it gets nearer to the earth where we can see, most of the red end of the spectrum has been absorbed and the blue is reflected back to our eyes. \n\nand sometimes there are particles that absorb other parts of the spectrum, which accounts for the colors of sunsets and etc.
128746
The sky is blue because of scattering of the sunlight by the atmosphere. According to Raleigh's law," The amt of scattering is inversely proportional to the 4th power of wavelength".Hence the shorter wavelengths r scattered much more than the longer ones. According to Raleigh's Scattering Law,blue light is scattered to a greater extent than red light. This scattered radiations causes the sky to appear BLUE.
1015359
using simple physics\n\nThe blue color of the sky is due to Rayleigh scattering. As light moves through the atmosphere, most of the longer wavelengths pass straight through. Little of the red, orange and yellow light is affected by the air.\n\nthe grass is green because the other colors are absorbed and only green is reflected. Grass and most other plants are green because they contain a pigment known as chlorophyll.\n\nSun isn't really yellow. The color yellow is a purely human interpretation of a collection of radiation that hits the retinae of our eyes and gets processed by our visual cortex.
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The blue color of the sky is due to Rayleigh scattering. As light moves through the atmosphere, most of the longer wavelengths pass straight through. Little of the red, orange and yellow light is affected by the air. \n\nHowever, much of the shorter wavelength light is absorbed by the gas molecules. The absorbed blue light is then radiated in different directions. It gets scattered all around the sky. Whichever direction you look, some of this scattered blue light reaches you. Since you see the blue light from everywhere overhead, the sky looks blue. \nAs you look closer to the horizon, the sky appears much paler in color. To reach you, the scattered blue light must pass through more air. Some of it gets scattered away again in other directions. Less blue light reaches your eyes. The color of the sky near the horizon appears paler or white.
858885
Blue.  The sea is 70% of the world's surface.
966396
AHHHH !!!!A question other than why is the sky blue.  The color of the sky is colorless, clear.  Look at the shots of earth from space (on the night side) you can see earth perfectly, no color enhancement.  Look up at the stars on a clear night, you can see them without any bluish color.\n\nThe sky is only various colors when the sun is shining thru it.
476620
The sky is blue because it would be ugly red....JK. The sky is blue because of all the mixes of gases in the atmosphere.  ;)
19151
Hey there Jenna!\n\nThe sky is blue on Earth.. why?  This is because of an effect called "Rayleigh scattering".  If you would like to learn more about Raleigh Scattering, I know a pretty neat site: http://www.sciencemadesimple.com/sky_blue.html\n\nHave a great day! :O)
339375
There are many reasons, it may be how the light is hitting the sea, the color of the sand, pollution or lack thereof, coral reefs, currents, and many other reasons.  Here is a great link about why water appears blue.  This may help answer your question.
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There are two reasons. Both are caused by a property of light -- it is made up of different wavelengths.\n\n(1) When light passes through our atmosphere, it diffracts & blue wavelength gets scattered towards earth. This is why the sky is blue. When viewed from the beach, the sea is also blue because it reflects the sky, of course.\n\n(2) Another reason is not by diffraction, rather, light under the sea is blue because water absorbs longer wavelength of light through distances over about 20 metres.
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because of tyndall effect as the blue clour as a longer wave length in the spectrum of colours it gets scaterd more in the sky \n\n\nmxwltan\n6 minutes ago\n\n\n\nThe Earth's sky is blue because the air molecules (largely nitrogen\nand oxygen) are much smaller than the wavelength of light. When light\nencounters particles much smaller than its wavelength, the scattered\nintensity is inversely proportional to the 4'th power of the\nwavelength. This is called "Rayleigh scattering," and it means that\nhalf the wavelength is scattered with 2**4 = 16 times more intensity.\nThat's why the sky appears blue: the blue light is scattered some 16\ntimes more strongly than the red light. Rayleigh scattering is also\nthe reason why the setting Sun appears red: the blue light has been\nscattered away from the direct sunlight.\n\nThus, if the atmosphere of another planet is composed of a transparent\ngas or gases whose molecules are much smaller than the wavelength of\nlight, we would, in general, also expect the sky on that planet to\nhave a blue color.\n\nIf you want another color of the sky, you need bigger particles in the\nair. You need something bigger than molecules in the air---dust.\n\nDust particles can be many times larger than air molecules but still\nsmall enough to not fall out to the ground. If the dust particles are\nmuch larger than the wavelength of light, the scattered light will be\nneutral in color (i.e., white or gray)---this also happens in clouds\nhere on Earth, which consist of water droplets. If the dust particles\nare of approximately the same size as the wavelength of light, the\nsituation gets complex, and all sorts of interesting scattering\nphenomena may happen. This happens here on Earth from time to time,\nparticularly in desert areas, where the sky may appear white, brown,\nor some other color. Dust is also responsible for the pinkish sky on\nMars, as seen in the photographs returned from the Viking landers.\n\nIf the atmosphere contains lots of dust, the direct light from the Sun\nor Moon may occasionally get some quite unusual color. Sometimes,\ngreen and blue moons have been reported. These phenomena are quite\nrare though---they happen only "once in a blue moon...." :) The dust\nresponsible for these unusual color phenomena is most often volcanic\nin origin. When El Chicon erupted in 1982, this caused unusually\nstrongly colored sunsets in equatorial areas for more than one year.\nThe much bigger volcanic explosion at Krakatoa, some 110 years ago,\ncaused green and blue moons worldwide for a few years.\n\nOne possible exception to the above discussion is if the clouds on the\nplanet are composed of a strongly colored chemical. This might occur\non Jupiter, where the clouds are thought to contain sulfur, phosphorus,\nand/or various organic chemicals.\n\nIt's also worth pointing out that the light of the planet's primary is\nquite insignificant. Our eyes are highly adaptable to the dominating\nillumination and perceive it as "white," within a quite wide range of\npossible colors. During daytime, we perceive the light from the Sun\n(6000 K) as white, and at night we perceive the light from our\nincandescent lamps (2800 K, like a late, cool M star) as white. Only\nif we put these two lights side-by-side, at comparable intensities,\nwill we perceive a clear color difference.\n\nIf the Sun was a hot star (say of spectral type B), it's likely we\nstill would perceive its light as "white" and the sky's color as blue
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The refraction (scattering) of light waves from the sun by our atmosphere causes the sky to appear blue.
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The sky is blue partly because air scatters short-wavelength light in preference to longer wavelengths. Where the sunlight is nearly tangent to the Earth's surface, the light's path through the atmosphere is so long that much of the blue and even yellow light is scattered out, leaving the sun rays and the clouds it illuminates red, at sunrise and sunset.\n\nIndividual gas molecules are too small to scatter light effectively. However, in a gas, the molecules move more or less independently of each-other, unlike in liquids and solids where the density is determined the molecule's sizes. So the densities of gases, such as pure air, are subject to statistical fluctuations. Significant fluctuations are much more common on a small scale. It is mainly these density fluctuations on a small (tens of nanometers) scale that cause the sky to be blue.
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The sky is blue because light reflects off oxygen molecules in the atmosphere, which makes it blue.\n\nGrass is green because of the chlorophyll in the grass.\n\nWater is wet because our nervous system detects it as such.
617565
The water particles,mixed in the air ( sky ), are responsible for this.The sunlight is refracted by those water molecules and thus we see the colour of the sky as blue.As you may remember,in the rainbow colours,Blue comes just after Violet and Indigo which are not that prominent as Blue. \nThus we see the sky blue.
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Well mostly the difference in colour of the oceans is due to the muddy and unclear waters. no waters have colour. But it is just the colour of reflection. Please see the site i am listing below. It is a q & a type forum only!!\n\n\nYou may get your answer here too!!\n\nWe see the water  great masses, seas, lakes, rivers, with colors: blue,  green, gray, \nsometimes brownish. But if one picks up a pot of that water the aspect is not colored.  \nSo the color is an optical phenomenon that is observed only when a large volume of water \nis considered and it depends on several things:\n-The water reflects the sky, so its color depends upon the sky colour at that time, and if \nit has white or grayish clouds.\n-At other hand  the water colour depends also from the material that is found  mostly into \nthe sea  water.\nThere are life there…animal and vegetal, a lot,included the  phytoplankton, microscopic \nplants that either float or are suspended there.  And of course there are  dissolved and \nsuspended also inorganic and organic matter coming from the sea floor and from rocks.   \nColor is the result of  optical interactions from the incident  solar light and the \nbillions of microscopic particles present.\nWhen the light of the sun reaches the sea surface different phenomena happen, part is \nreflected, part is absorbed and some is scattered. These phenomena happens with the water \nitself, the dissolved organic and inorganic matter and the suspended particles.\nThe colour of sea water depends upon  the distribution of these facts. It is blue for clear \nocean water and shifts to darker for less transparent or more turbid waters, and depends \nalso from the depth and transparency of the considered layer of water. And that colour can \nbe seen from space! That is why our planet Earth is called the "blue planet". Isn´t that \nwonderful?\nAnd thanks for asking NEWTON!
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One of the most common questions on YA!\n\nA clear cloudless day-time sky is blue because molecules in the air scatter blue light from the sun more than they scatter red light.  When we look towards the sun at sunset, we see red and orange colours because the blue light has been scattered out and away from the line of sight.\n\nSee the link below for full details.