why is the sky always blue and sea almost always green..........?

Answer 1

Well, not to belabour the obvious, but the sky looks blue because it IS blue. And the sea looks green because it IS green. But let me expand on that:

If you look straight at the sun you'll see pretty much white - most of the light gets straight through. If you look in a different direction, you will see the light that was coming from the sun, heading for a different spot, and then deflected in your direction. It is easier to deflect short (blue) wavelengths than long (red) ones, so most of the time the sky looks blue. But you'll note that when the sun is low on the horizon (during sunrise and sunset) it will often look reddish... now that the sunlight is passing through more of the air, almost everything BUT the red is deflected. You see where the light is deflected to after the sun goes down - for a while, you can't see the sun but there's still light to see by... all that deflected light!

Now water is also blue. Very faint blue. You can't see it in a glass of water because your eyes aren't sensitive enough, but you'll note that swimming pools and sometimes the ocean too looks blue. That's the water. Of course, the ocean doesn't JUST have water in it - particularly the top is chock full of plankton. These are plant microorganisms. You can't see these guys much either, but like most plants they're green, and so they give the ocean a greenish tint, if not an overt green color. Like most plants they are dependant on light, so they live only within a few meters of the surface. If you dive down, the water will look blue even if it seems green on the surface!

Hope that helps!

Answer 2

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.

Scattering and absorption are major causes of the attenuation of radiation by the atmosphere. Scattering varies as a function of the ratio of the particle diameter to the wavelength of the radiation. When this ratio is less than about one-tenth, Rayleigh scattering occurs in which the scattering coefficient varies inversely as the fourth power of the wavelength. At larger values of the ratio of particle diameter to wavelength, the scattering varies in a complex fashion described, for spherical particles, by the Mie theory; at a ratio of the order of 10, the laws of geometric optics begin to apply.

Individual 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.

Answer 3

The sky is blue because that is the color sunlight is reflected as. Depending on which beach you go to, the water varies in color. If you go to a tropical island, it will most likely be crystal clear blue. If you go to new jersey, it will be green cause of all the chemical dumping. I think algae only changes the colors of lakes and smaller bodies of water.

Answer 4

Why Is the Sky Blue? (When sunlight shines into the earth’s atmosphere it is scattered in all directions by gas molecules. Since they tend to scatter blue light more than the other colors, the sky appears to be blue.)

The vast regions of outer space are shrouded in darkness. What we call sky is the atmosphere that surrounds the earth, the region of space that is visible to the human eye. Looking up into this large expanse, the sky, many have wondered, ‘Why is the sky blue?’ Why not violet, green, yellow, orange, or red—the other basic colors of the visible spectrum?
Sunlight consists of light of various wavelengths, which are seen as the different colors of the visible spectrum. The longest of these light waves are red, and the shortest are blue or violet. The gas molecules of our atmosphere scatter far more light of the shorter wavelengths, the blue, than of the longer wavelengths, the red. As a result, clear sky has a blue color. The air surrounding the earth, with its innumerable particles of solid materials, such as dust, scatters light to give the appearance of visibility, as though reflected from a mirror.
On the other hand, when the sun is near the horizon, sunlight travels through a greater amount of atmosphere to reach the eye, and the longer waves penetrate better than the shorter waves, causing the sky to take on a deep orange and red appearance. Solid particles in the air accentuate the reddening. Similarly, when smoke or dense clouds fill the sky, light waves of all colors are scattered. This causes the sky to appear gray.

This awesome display of God’s use of light in the atmospheric heavens reminds us of the words of the psalmist: “The heavens are declaring the glory of God; and of the work of his hands the expanse is telling.”—Psalm 19:1.

Answer 5

I even have a number of circumstances. between the circumstances we've been in our residing house and you felt the residing house start up shaking throughout and the wind blows so confusing that it feels like a prepare going appropriate next on your residing house. yet yet back we had taken shelter decrease than a bridge. it is in comparison to interior the flicks which you get sucked out. The twister jumps over the bridge besides the indisputable fact that it is windy sufficient so which you will carry directly to something. (you already know the place the homeless human beings carry close out decrease than there on the astonishing the place the crevices are.) It additionally regarded like a prepare going by because of the wind. I stay in 60 miles South East of Dallas in Texas.

Answer 6

The sky is not always blue, like right now the sky is grey, it is about to rain, and it is cold. The sea is not always green, in New York it is dirty brown or dark grey.

Answer 7

Actually, the sea IS blue. How do I know this? Well, the reason the sky is blue is because it reflects the water on earth. So if the water on Earth was green, our sky would be green.

The reason the sea appears green is because of algae in it.

Answer 8

lol come visit galveston beach near houston, Texas.......there is a brown beach for you,,,,nasty!.....we don't have coral reefs which filter clean the water. thats why its brown....