Why is the planet Earth called blue? Is it so?

Everyone probably heard more than once that the Earth is called the "blue planet". The land received this name not so long ago, because earlier people simply did not have
The ability to see your planet from a sufficient distance to be sure of its primary color. But are you sure that you remember exactly why the planet
Is the earth called blue?

Occurrence

Water in the universe was always. Yes, at first these were not streams of water, but only minute molecules that settle on dust particles and various cosmic bodies.
After a while these motes and bodies merged into one huge formation, which was destined to become the Earth.

Having looked at our homeland only 4.5 billion years ago, no one would have guessed why the planet Earth is called blue. It was a huge piece of boiling mush and erupting lava. Long millions of years, the gases released during these processes formed the atmosphere of the Earth. There were methane, nitrogen, hydrogen sulphide, hydrogen, and carbon dioxide. There was no free oxygen here.

It was not until until slightly less than 4 billion years ago the atmosphere cooled to 100 degrees - then the process of condensation finally allowed the pair
Turn into a liquid. Infinite drops, streams, whole streams of real water hit the Earth. Incredible storms raged on our planet
Millennia. There was literally a flood! Nearly boiling rains poured down on the ground with endless streams. First small rivers, then ever wider rivers
Merged into one place, gradually turning it into the World Ocean. However, then it was just dirty water, bubbling from the heat and constant
Filling. And it was only after many hundreds of centuries that the waters of the oceans became clean, cool, that is, they assumed the kind that we can observe today.

Water - this is the substance that made our planet unique and gave birth to life on planet Earth.

The Blue Planet

Astronauts say that if you look at the planet Earth from a satellite, first of all pay attention to its blue color. This is due to the properties of our
Atmosphere and the very surface of the planet (the only one on which water is in liquid form). In addition, our planet is unique in the presence of oxygen
Atmosphere and protective ozone film, which prevents the negative effects of the rays of the stars. Today, to make sure that cosmonauts are right,
Just see the photo of the Earth from the satellite.

Color of the ocean

On the other hand, it's strange why the planet Earth is called blue, because water has no color. However, most of the sea water is human
Look exactly in blue. Sometimes the sea can be green, black or yellowish. What's the matter?

And the reason is simple: the color of the water we see in the sunlight. And any ray, as is known, includes all the colors of the rainbow. The wavelength for each color is different,
Respectively, and they can penetrate into the water column at different depths. The shortest waves are red, the longest - the blue. Exactly
For this reason, waves of different colors are reflected in different ways. And this gives us the opportunity to see the seas of different colors.

Of course, there are still seas of red color, but the story of them is a completely different story, because their color is caused by a large number of red algae in
The surface of the sea, and not the water capacity for sunlight.

Blue sea

The depth of penetration of light into the sea depends on the transparency of the water. Reflects light from microscopic particles, such as algae or their particles, present
In any sea in the form of suspensions. The upper layers of the seas and oceans are not rich in these particles, because they descend. For this reason, the blue part of the spectrum has
Possibility to be reflected at great depth.

All the tropical seas can boast microalgae, so they all have a blue color if you look at the planet Earth from a satellite or even from a rock.

Other color

The waters of those seas that do not have a constant temperature or have an active current are constantly mixed, bringing to the upper layers a large number
Nutrients. Water for this reason seems much more turbid, the light of the Sun is unable to penetrate beyond the upper layers, so the blue rays are not there
Are reflected. The color of the water will vary from green to brown.

It would seem, why the planet Earth is called blue, if the color of the seas in all its territory is different? The fact is that when viewed from a satellite, sunlight
Is reflected not only in water, but also passes through the atmosphere itself. And in this same atmosphere, the beam also reflects primarily in the blue spectrum. Of course,
There are also pure white cloud swirls, but these are just too dense clusters of vapor water that can not pass long waves. This is reflected in both water and air, a bright, saturated blue color and we see in the photographs of the globe.