How much fresh water is there in the world. How much fresh water there is on Earth

It is understood that although some areas of the earth are covered by water, there are still fresh water resources.

But it is extremely limited. Of the total water resources, it is salty water and cannot be directly drunk. Of the remaining freshwater, 87 per cent is ice and snow from polar ice sheets, mountain glaciers and permafrost that are difficult for humans to use.

What humans can really use is the rivers, lakes and groundwater, which account for only about about the total amount of water on the planet, and they are unevenly distributed. About 65 per cent of water resources are concentrated in less than 10 countries, compared to 80 countries and territories that account for about 40 per cent of the world's population.

But there is a severe shortage of water. According to statistics released by the United Nations, 1.1 billion people in the world currently live without water and 2.6 billion people lack basic sanitation.

Due to the different geographical environments of countries and regions, the amount of water resources available varies greatly. In order of water resources, the top few are: Brazil, Russia, Canada, the United States, and Indonesia.

China, India. If averaged over the population, it's a different result. The per capita water resources of Chinese are equivalent to 1 4 of the world's per capita resources.

China is a country with water shortage, frequent floods and droughts, if considered according to the total amount of water resources, the total amount of water resources ranks sixth in the world, but China has a large population, if calculated according to the per capita water resources, the per capita occupancy is only 2,500 cubic meters, about 1 4 of the world's per capita water volume, ranking 110th in the world. (According to the statistics of 149 countries, the United Nations 1990 population statistics are uniformly used), and it has been listed by the United Nations as one of the 13 water-poor countries.

The Earth's freshwater reserves account for only 100 million cubic kilometers of the world's total water, and some of them belong to solid glaciers.

Freshwater is water with less salt content. The usual drinking water for people is freshwater. The total amount of water on the earth is 1.4 billion cubic kilometers, there is a lot of water on the earth, and the reserves of fresh water only account for the total amount of water in the world, and some of them belong to solid glaciers, which are distributed in the high mountains and the north and south poles that are difficult to use, and some fresh water is buried deep underground, which is difficult to exploit.

At present, human beings can directly use only groundwater, lake freshwater and riverbed water, the sum of the three accounts for about the total amount of water on the earth, the amount of freshwater resources used by human beings is getting larger and larger, except for the deep groundwater that cannot be exploited, the water that human beings can actually use only accounts for about the total amount of water on the earth.

To date, human freshwater consumption accounts for 54 per cent of the world's available freshwater supply, and freshwater accounts for less than 1 per cent of the world's total water supply. However, the problem of freshwater pollution has not been completely eliminated. Therefore, the protection of water quality and the rational use of freshwater resources have become major issues of general concern to mankind today.

The total amount of freshwater in the world is about 100 million cubic kilometers, and the majority of the world's freshwater is preserved in the form of permanent ice or snow and groundwater.

The only amount of fresh water that can be used is the total amount of water on the planet.

But now, due to climate change, glaciers are melting, and there is no idea how much freshwater is available to humans, so there should be a small increase.

However, the relative drought problem will be more serious, and the water pollution will also be more serious.

The percentage of freshwater resources on the planet out of the total water volume is: However, the total amount of freshwater available for human use only accounts for the total freshwater storage on the earth, which is equivalent to 3/100,000 of the total water volume of the earth.

Water is the most abundant natural substance on the earth's surface, covering more than 70% of the earth's surface area. But the earth's freshwater accounts for only a large amount of water, and 70% of the freshwater is solid water, stored in the Arctic and Antarctic and snowy peaks; is groundwater; Fresh water that can be easily used by humans only accounts for about a large number of people. More than 2 billion people in 80 countries are now facing water scarcity.

In many countries in the Middle East and Africa, per capita water resources are below the 1,000 cubic meters per person-year. In Kuwait, desalination of seawater is as expensive as producing oilIn the future, once a global water crisis breaks out, a drop of water will be worth as much as a drop of blood, and the dispute over water will be the trigger for a global war.

Water shortage is a major challenge facing mankind in the 21st century.

The amount of water on Earth is distributed in such a way that oceans account for icebergs and glaciers, groundwater, lakes, and the atmosphere (water vapor), while rivers and streams account for only.

Of these, only fresh water from groundwater, lakes, rivers and streams can be used by people, animals and plants, which means that the amount of water that the earth can supply to life on land is less than 1% of its total waterIt can be seen that freshwater resources are limited and precious, and their pollution will further reduce the amount of freshwater available for plants, animals and humans, thus directly affecting the survival of life on earth.

The total amount of water on the earth is 1.4 billion cubic kilometers, there is a lot of water on the earth, and the freshwater reserves only account for 100 million cubic kilometers of the world's total water, and some of them belong to solid glaciers.

The total mass of the Earth's oceans is about tons, which is equivalent to 1 4400 of the total mass of the Earth. The ocean covers an area of square kilometers, with an average depth of 3,682 meters and a total volume of about cubic kilometers. If all the Earth's surfaces were at the same altitude and were a smooth spherical surface, the average depth of the Earth's oceans would be kilometers.