Why is the Earth called the blue planet? Detailed answer

BIG ENCYCLOPEDIA FOR CHILDREN AND ADULTS
Free library / Directory / Big encyclopedia for children and adults

Why is the Earth called the blue planet? Detailed answer

Big encyclopedia for children and adults

Directory / Big encyclopedia. Questions for quiz and self-education

Did you know?

Why is the Earth called the blue planet?

Because three quarters of the earth's surface is covered with water. Seas and oceans occupy 361,06 million km², or 70,8% of the surface. The average depth of the world ocean is 3795 m, and the greatest - 11022 m in the Mariana Trench of the Pacific Ocean.

The average salinity of sea water is 3,5%, the average temperature is 3,8 °C. It ranges from -1,9 °С in polar waters to +29 °С in tropical seas. In addition to salt, sea water contains many other minerals, including compounds of gold and other precious metals.

Author: Mendeleev V.A.

Random interesting fact from the Great Encyclopedia:

In which direction does the water in the bath drain?

a) Clockwise.
b) counterclockwise.
c) vertically down.
d) Depends on the circumstances.

Depends on the circumstances. The widely held belief that the water in a bathtub spirals when drained under the influence of the Coriolis force caused by the rotation of the Earth around its axis is erroneous.

Although the Coriolis force does affect large and long-term synoptic situations such as a hurricane or an ocean current, it is too weak to have any effect on domestic sewers. The direction of the drain depends on the shape of the sink, from which side it was filled, as well as on the rotation introduced by the washing process itself or when you pull out the plug.

Of course, if you take a perfectly symmetrical vat with a tiny drain hole and a stopper that you can pull out without disturbing the balance of the water, fill this vat and leave it for a week so that any movement completely subsides, then, in theory, you can notice a very weak Coriolis effect, which in the Northern Hemisphere would have a counterclockwise direction, and in the Southern Hemisphere - clockwise.

Many believed in such a myth thanks to the plot included in one of Michael Palin's programs "From Pole to Pole". It was a film about a showman from the Kenyan city of Nanyuki, who tried to demonstrate the Coriolis effect on different sides of the equator. But even if we assume that such an effect really exists, it is in this film that the direction of circulation just turned out to be exactly the opposite.

Test your knowledge! Did you know...

▪ Why did the Portuguese prince Henry the Navigator get his nickname?

▪ Are plants responding to upcoming weather changes?

▪ Why is India called the "pearl" of the British Empire?

See other articles Section Big encyclopedia. Questions for quiz and self-education.

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

Machine for thinning flowers in gardens 02.05.2024

In modern agriculture, technological progress is developing aimed at increasing the efficiency of plant care processes. The innovative Florix flower thinning machine was presented in Italy, designed to optimize the harvesting stage. This tool is equipped with mobile arms, allowing it to be easily adapted to the needs of the garden. The operator can adjust the speed of the thin wires by controlling them from the tractor cab using a joystick. This approach significantly increases the efficiency of the flower thinning process, providing the possibility of individual adjustment to the specific conditions of the garden, as well as the variety and type of fruit grown in it. After testing the Florix machine for two years on various types of fruit, the results were very encouraging. Farmers such as Filiberto Montanari, who has used a Florix machine for several years, have reported a significant reduction in the time and labor required to thin flowers. ... >>

Advanced Infrared Microscope 02.05.2024

Microscopes play an important role in scientific research, allowing scientists to delve into structures and processes invisible to the eye. However, various microscopy methods have their limitations, and among them was the limitation of resolution when using the infrared range. But the latest achievements of Japanese researchers from the University of Tokyo open up new prospects for studying the microworld. Scientists from the University of Tokyo have unveiled a new microscope that will revolutionize the capabilities of infrared microscopy. This advanced instrument allows you to see the internal structures of living bacteria with amazing clarity on the nanometer scale. Typically, mid-infrared microscopes are limited by low resolution, but the latest development from Japanese researchers overcomes these limitations. According to scientists, the developed microscope allows creating images with a resolution of up to 120 nanometers, which is 30 times higher than the resolution of traditional microscopes. ... >>

Air trap for insects 01.05.2024

Agriculture is one of the key sectors of the economy, and pest control is an integral part of this process. A team of scientists from the Indian Council of Agricultural Research-Central Potato Research Institute (ICAR-CPRI), Shimla, has come up with an innovative solution to this problem - a wind-powered insect air trap. This device addresses the shortcomings of traditional pest control methods by providing real-time insect population data. The trap is powered entirely by wind energy, making it an environmentally friendly solution that requires no power. Its unique design allows monitoring of both harmful and beneficial insects, providing a complete overview of the population in any agricultural area. “By assessing target pests at the right time, we can take necessary measures to control both pests and diseases,” says Kapil ... >>

Random news from the Archive

Quantum dot photosensors outperform CMOS sensors 23.11.2015

The digital camera market could be revolutionized. The young company InVisage Technologies has proposed photosensors that are superior in all respects to traditional silicon CMOS sensors.

In this case, a new type of sensors can be manufactured on the same equipment as CMOS-type sensors.

It's important to emphasize that InVisage didn't just announce a new development. She approached the stage of pilot deliveries of innovative Quantum13 sensors with a resolution of 13 megapixels. All interested smartphone manufacturers, and according to rumors, Sony is among them, can get a new product to test its properties. If positive, InVisage sensors may appear in smartphones in the foreseeable future.

The essence of the development of InVisage is that its sensors do not have a layer of photodiodes, traditional for CMOS sensors. Instead of an array of silicon photodiodes, the incident light is captured in the form of a charge in a thin layer of transparent polymer film interspersed with "quantum dots" made of a special material. It is reported that these are elements of the metal-chalcogenide type from groups II-VI of the periodic table. Thus, it was possible to reduce the thickness of the photosensors from 2-3 microns to 0,5 microns. Reducing the thickness of the photosensitive layer and, consequently, expanding the angles of incidence of light, will also reduce the thickness of the optical system and make smartphone cameras thinner.

In addition, the nonlinear charge of the photosensitive layer based on quantum dots will expand the dynamic range of sensors. Also, a new type of sensor absorbs light eight times faster (gaining charge) than photodiodes in CMOS sensors. The accelerated image capture opens the way to the so-called global shutter, when the image is taken from the entire matrix at once when shooting a video, and not line by line, as it is now. All together promises to significantly improve the mobile shooting of photos and videos.

Other interesting news:

▪ Aspirin is the culprit of death

▪ Imaginary multitasking improves brain function

▪ Plantronics Explorer 50 Dual Headset

▪ Panasonic 10x cameras

▪ Hydrofoil Electric Taxi Candela P-12

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ site section Power supply. Article selection

▪ Mill article. History of invention and production

▪ Article What stars are called new? Detailed answer

▪ article The functional composition of Futic TVs. Directory

▪ Article Two options to mute the microphone. Encyclopedia of radio electronics and electrical engineering

▪ article External voltage converter for a laptop. Encyclopedia of radio electronics and electrical engineering

Leave your comment on this article:

All languages of this page

Home page | Library | Articles | Website map | Site Reviews