How much is a square kilometer of the earth worth? Detailed answer

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

How much is a square kilometer of the earth worth? Detailed answer

Big encyclopedia for children and adults

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

Did you know?

How much is a square kilometer of the earth worth?

Alaska was discovered by Russian explorers in the 1783th century. In XNUMX, Grigory Ivanovich Shelekhov, a navigator and traveler, founded the first settlement on Kodiak Island off the southern coast of Alaska. Later Alaska became known as Russian America. Russian people hunted, fished, built ships here.

The main city of Russian America was Novoarkhangelsk (now Sitka) on one of the Aleutian Islands - Baranov Island.

Controlling distant Alaska and defending it from Central Russia was difficult, and in 1867 Russia sold Alaska to America for $7,2 million (less than $5 per square kilometer).

This deal turned out to be unprofitable: almost simultaneously with the sale, large deposits of gold were discovered in Alaska, and later other minerals.

Author: Cellarius E.Yu.

Random interesting fact from the Great Encyclopedia:

Why does the sun shine?

The Sun is also the closest star to the Earth. We know that life depends on the Sun. Without solar heat, life would not have arisen on Earth. Without sunlight, there would be no green plants, animals, humans.

The Sun is over 172 km from Earth. The mass of the Sun is 000 times the mass of the Earth. But, interestingly, the Sun is not as solid as the Earth.

Proving this is very simple: the surface temperature of the Sun reaches 6000 °C. At this temperature, any metal or stone turns into gas, so the Sun must be a ball of gas!

In the past, scientists believed that sunlight and heat were the result of combustion. But the surface of the Sun has been hot for hundreds of millions of years, and nothing can burn for that long.

Today, scientists believe that the Sun releases heat as a result of processes similar to those that occur in an atomic bomb. The sun turns matter into energy.

This process is different from combustion. During combustion, one form of matter passes into another. In the transition of matter into energy, a minimum amount of matter is needed to produce a huge amount of energy. Twenty-eight grams of matter releases enough energy to melt more than 1 million tons of rock.

So, if science is right, the sun shines because there is a constant transformation of matter into energy. One percent of the Sun's mass is enough to keep it hot for 150 billion years!

Test your knowledge! Did you know...

▪ What are hormones for?

▪ How is rap different?

▪ Why did pantyhose get such a name by mistake?

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

Ecology of roads 15.09.2000

The total length of highways in the United States is 6,2 million kilometers, they cover one percent of the territory, which corresponds to the area of the state of South Carolina (almost twice the size of the Moscow region). But the negative impact of roads on the ecological state of the area extends over a much larger area.

Based on data from studies conducted in Holland and Massachusetts (USA), Richard Foreman of Harvard University calculated that a road that drives 10 cars a day through a forest spreads its negative impact on a strip 305 meters wide. This is noise, dust, polluted air, sometimes - both garbage and seeds of plants alien to the area, in winter - salt water runoff.

As a result, the harmful effects of roads extend to one-fifth of the entire US.

Other interesting news:

▪ Mont Blanc has risen again

▪ vegetable mine detector

▪ TLV73333P New 300mA Capacitorless LDO Regulator

▪ Possum antidote

▪ Soda spoils the eyes and heart

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ section of the site Car. Article selection

▪ article Calculation of screws. Tips for the home master

▪ article Who Invented Perfume? Detailed answer

▪ article Working on a cutting machine. Standard instruction on labor protection

▪ article Features of the use of fluorescent lamps. Encyclopedia of radio electronics and electrical engineering

▪ article Norms of acceptance tests. Tubular arresters. 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