Is there enough drinking water on the planet? Detailed answer

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Is there enough drinking water on the planet? Detailed answer

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Is there enough drinking water on the planet?

Although over 70% of the planet's surface is covered with water, fresh water suitable for drinking makes up only 3% of all water resources. Two-thirds of the Arctic and Antarctic ice is made up of drinking water, but only about 12 km³ available for use.

Considering that water consumption has tripled over the past 40 years, and water purification by industrial enterprises has not improved, by about 2025 water consumption in many countries, including in Central Europe, may become limited.

Author: Mendeleev V.A.

Random interesting fact from the Great Encyclopedia:

What are the sizes of the biggest bear?

Due to the fact that bears can stand on their hind legs, and some of them can reach impressive sizes, all sorts of stories about them are quite common, which are full of all sorts of exaggerations. There are legends about great hunters who fought or killed giant bears. There are quite large individuals in the bear family.

Bears are without a doubt the largest of all predatory animals. A lion, for example, rarely weighs more than 230 kilograms. The largest tiger can weigh 270 kilograms. But a large polar bear or grizzly bear can reach a weight of 400-450 kilograms.

The largest of the bears are the Alaskan brown bears. Some males weigh more than 680 kilograms, and their height on their hind legs can reach three meters. This is a very big bear! On the other hand, let's remember the Malayan bears, which even in adulthood weigh less than 45 kilograms.

There are two funny misconceptions about bears. One of them is that they are clumsy and clumsy, the other is that they are stupid. Neither one nor the other is true. The bear may appear clumsy due to the nature of its gait. Bears are flat feet: this means they plant their heels on the ground like a human. When a bear walks, it steps simultaneously with both paws located on one side of its body. Because of this, he has a waddling gait. But don't let that confuse you. A bear rushing on all four legs can catch up with any running person!

Because bears look so clumsy and slow, people think they aren't smart either. But ask any zookeeper, and he will tell you that the bear is the most intelligent and quick-witted of all animals. In addition, in Europe, bears are often trained to perform all sorts of circus acts.

There are four main types of bears in North America: the black bear, the grizzly bear, the Alaskan brown bear, and the polar bear. Grizzlies are the most cruel of them all. This is, without a doubt, the most dangerous beast of all the mammals in America. In the old days, the Indians considered him one of their worst enemies, and a warrior who could kill a grizzly was considered a great brave man!

Test your knowledge! Did you know...

▪ Why is electricity called electricity?

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Random news from the Archive

Dogs look like their owners 17.08.2004

Observant people have been talking about this for a long time, but a scientific assessment of the degree of similarity between dogs and their owners has been carried out for the first time.

Psychologists from the University of California at San Diego (USA) went to a park where local dog owners walk with their pets and photographed 45 dogs (25 purebreds and 20 mutts) and their owners. They were filmed separately and against different backgrounds. Then the obtained photographs were shown to 28 students and asked to arrange the pictures in pairs "dog - owner".

The similarity was considered proven if more than half of these "arbitrators" correctly made one or another pair. Result: the owners of 16 out of 25 purebred dogs were identified correctly, but with the mutts the task turned out to be more difficult. Only 7 out of 20 were recognized as similar to the owners. It was found that the degree of similarity does not depend on how long the person and the dog live side by side.

The authors of the study cannot give a clear explanation for their results. Perhaps, they say, in the case of thoroughbred dogs, each one chooses a pet corresponding to the owner, if not in appearance, then in the general style of his appearance. In the case of mutts, this is difficult to do, since, as a rule, no one can say in advance what a pooch puppy will grow into.

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