Why is there less fresh water, and why is there a shortage of fresh water???

Fresh water is the evaporation of seawater, into the air, forming clouds, and through precipitation (rain or snow, etc.) into the land, forming fresh water. Trace back to the origins of the earth.

Precipitation (i.e., fresh water) that enters the land is absorbed by the land, forming groundwater and snow at high levels. When groundwater is saturated (i.e., the ground can no longer absorb more water), lakes form in low-lying areas. Rivers are formed when the snow melts in the high mountains.

That is, when the land is saturated with fresh water, the excess fresh water flows into the sea with the river. This creates a balanced ecosystem.

With human civilization.

The development of more and more population, the behavior of human beings to destroy the environment, so that the ability of the land to absorb water is reduced, and the human water is also more and more, the vast majority of which is fresh water, (including domestic water, industrial water, etc.), groundwater is constantly decreasing, and rivers are drying up. So there is less and less fresh water.

Salt water can be desalinated.

That same fresh water will be salted (

The water is doped with heavy metal salts, such as industrial wastewater, so that the water can not be used) domestic wastewater must also be purified, distilled, and degraded before it can be reused, but the cost will be very high, which is also a major problem for environmental protection now. In addition, water vaporizes, and the ozone layer void causes a very small part of the water to be lost to outer space, and it is no longer able to participate in the water cycle on land and in the oceans. Hope it helps.

The reasons for the shortage of freshwater resources are: (1) uneven distribution of freshwater resources; (2) water consumption has increased greatly; (3) Serious water pollution; (4) Waste is common.

Solution: (1) Conservation and rational use of water; (2) prevention and control of pollution; (3) prevent soil erosion; (4) Construction of water conservancy facilities.

World Water Day - 22 March.

Compared with other countries in the world, China's total water resources are less than Brazil, Russia, Canada and Indonesia, ranking 6th in the world; In terms of water resources per capita, it is only 1 4 of the average, ranking after 110th.

The current state of our country's water resources.

1. The total amount of water resources is large, and the per capita occupancy is small.

2. The spatial and temporal distribution of water resources is uneven.

a, from the perspective of spatial distribution, there are more in the south and less in the north.

b. From the perspective of time distribution, there are more summers and fewer winters.

3. The utilization rate of water resources is low and the waste is amazing.

Water pollution is severe.

Construction of reservoirs. Water is unevenly distributed in time.

The spatial distribution of water is uneven.

Rational use and protection of water resources.

Water resources are wasted and water pollution is serious.

Conserve water and conserve water resources.

Inter-basin water transfer.

In a sense, saving water is more important than transferring water!

Introduce Huang into Jin. Reservoirs can store water during flood periods to slow down downstream flooding; Release water during dry seasons to increase the amount of water downstream.

The construction of reservoirs can effectively regulate the seasonal changes of runoff and water volume, and is an effective measure to solve the uneven distribution of water resources over time.

In addition, the reservoir also has comprehensive benefits such as flood control, power generation, irrigation and urban water supply.

Aerial view of the Three Gorges Project on the Yangtze River.

The site of the Three Gorges Dam - Zhongbao Island.

Xiaolangdi Water Conservancy Hub.

Xiaolangdi earth-rock dam.

Agricultural water saving: 1. Change the irrigation technology mode, waste flood irrigation, artesian irrigation, promote sprinkler irrigation, drip irrigation, and improve the effective utilization rate of water.

2. Change crop varieties, plant drought-tolerant and low-water-consuming crops in water-scarce areas in the north, and save irrigation water.

3. Reduce the use of chemical fertilizers and pesticides, and reduce water pollution.

Sprinkler drip irrigation.

Industrial water saving: 1. Industrial water reuse, recycling, and improving the utilization rate of water.

2. Reduce water consumption and save water in production.

3. Sewage treatment and standard discharge.

Speak your mind. Please use P84** to illustrate with examples of how to save water and protect water resources in your family life.

Household water saving: 1. One water for multiple purposes.

2. Promote water-saving appliances.

3. Use less detergents and detergents.

The green circle represents the earth, and the blank part of the logo resembles a hand holding up a drop of water. Hand is a deformation of the letters J and S, implying water saving, indicating that water conservation requires public participation, encouraging people to start from me, and everyone to save every drop of water; The hand is like a winding river, symbolizing the flow of water into a river.

World Water Day - 22 March.

Water Week in China – March 22 to March 28.

Will the planet's fresh water run out one day? Why is freshwater so scarce?

There is much more saltwater (seawater) than fresh water on the earth, and fresh water mainly comes from rain, melting snow and ice, and some formation water (spring water, well water). On the other hand, high water consumption and serious water pollution have led to a shortage of fresh water. Differences in precipitation time, local differences, leading to floods, droughts.

This is the water cycle. Fresh water flows into the sea, but the sea evaporates a lot of water vapor, which blows inland and then rains down. Some of the seawater seeps into the bottom, becomes fresh water through underground infiltration, and then spreads inland, and the water in the ocean is evaporated by the sun to form clouds, and the clouds drift and drift, and it rains on land. This freshwater enters the land, seeps into the ground or becomes a river, and eventually flows back into the ocean.

Land, atmospheric, and ocean water are constantly exchanged and transported through a three-phase change of solids, liquids, and gases, which creates the uniqueness of the water cycle. The movement of water includes both horizontal and vertical movements. Moving horizontally, it is liquid water flowing from high to low on the ground, and gaseous water moving with the air flow in the air.

Vertical movement is mainly as follows: 1. Due to sunlight, part of the water in rivers, rivers, lakes, seas and soil turns into water vapor and enters the atmosphere; 2. Plants absorb water from the roots, and the water evaporated from the body surface of animals enters the atmosphere through transpiration; 3. When the water vapor in the atmosphere is cold, it returns to the ground in the form of rain and snow.

When freshwater rivers wash the land, a small amount of minerals will be dissolved in the water, and the earth has been formed for billions of years, and the oceans have existed for billions of years, and the continuous evaporation has increased the concentration of minerals in the seawater.

In addition, submarine volcanic eruptions and precipitation on the ocean surface can also cause some minerals to dissolve in the ocean. There are many saltwater lakes in the western part of our country, the water in them mainly comes from the meltwater of the snow-capped mountains, and these lakes lack the way for the water to flow out, and the meltwater of the snow-capped mountains accumulates there after reaching these places in addition to evaporation and seepage into the ground, and because the replenishment of water is slightly less than the amount of evaporation, the precipitation is also scarce, and finally the salt content of the water in the lakes also increases.

Every year, a large amount of salt is sent into the ocean by the river water, and the continuous evaporation makes the ocean have the current salt content, but the concentration of sea water will not increase indefinitely, and the salt mineralization and the salt entering the ocean every year have formed a dynamic equilibrium.

Fresh water flows into the sea and becomes salty water and flows into the sea, but the sea evaporates a lot of water vapor.

Freshwater is freshwater.

Seawater is seawater.

Not a type of water.

It can be separated by the cycle of nature.

Fresh water is not going to get less.

No, because water is circulating, seawater will evaporate and then turn into rain.

This is a water cycle system, so there should be no less.

If it is going to be less and less, we will have no fresh water to drink now.

No, it won't. The amount of precipitation is very abundant.

But there is no shortage of water.

Freshwater is a form of water resources on Earth, and it is only a small fraction of the total global water resources. According to the United Nations, about salt water and only fresh water are about fresh water in the earth's water resources. Much of this freshwater is trapped in glaciers, snow and ice, groundwater, and soil humidity, and cannot be directly used by humans.

Freshwater available for direct human use is only a small fraction of this. According to World Bank estimates, the global availability of freshwater is only about about half of the total amount of water on Earth. This further illustrates the scarcity of freshwater in the earth's water resources.

This data shows that although there is a lot of water on the Earth's surface, there is a limit to the amount of freshwater available for direct human use. This is why the conservation, management and rational use of freshwater resources are essential for sustainable development.

Less than three percent of the planet's freshwater is used. All terrestrial life depends on freshwater in the final analysis, which determines the distribution of life on Earth, water vapor rises from the sea, is carried inland by the wind, and with the increase in altitude, converges into clouds to form rainfall, which is also one of the basic ** of freshwater. Streams converge to form a rushing river that carves out the wonders of nature, and its shores provide habitat for wildlife and nurture a wealth of species, whether in the mountains or at the bottom of lakes, where there is fresh water, there is life.

The opposite of the type of water scarcity is water quality scarcity. In the southern part of China, the precipitation is relatively large, and the surface water resources are more than those in the northern region, so it is reasonable to say that there is no water shortage problem. However, due to large-scale wastewater pollution, the water pollution of rivers and lakes is serious, and as a result, the large rivers are guarded without water.

This phenomenon of water scarcity caused by deterioration of water quality is called water quality scarcity. Water sensitivity and qualitative water shortage have become a serious symbol of environmental degradation in China. In arid and semi-arid climate zones, surface water resources are extremely scarce due to low precipitation and high evaporation.

This phenomenon of water scarcity caused by drought is called water source scarcity. Most of the northern regions of China belong to the water shortage area. In order to solve the problem of water shortage in northern China, the state has launched the "South-to-North Water Diversion" project.

With the growing demand for freshwater, freshwater has become an important determinant of economic development in many arid and semi-arid regions.

Summary. Kiss hello, <>

Less than three percent of the planet's freshwater is used. More than 97 percent of the Earth's water is in the sea, and less than 3 percent is freshwater, most of which is stored in the form of ice in the Arctic and North poles.

Fresh water accounts for less than that.

Hello, <>

Less than three percent of the planet's freshwater is used for oak rentals. More than 97 percent of the earth's water is in the sea, and less than 3 percent is freshwater, most of which is stored in the form of ice in the Arctic and Arctic Poles.

Seawater is saltwater and cannot be directly drunk, so the water resources commonly referred to mainly refer to the freshwater resources on land, such as river sedan water, fresh water, lake water, ground orange water and glaciers.

Less than 1% of the Earth's freshwater or water from the mountains can be used directly by humans, mainly in lakes, rivers, reservoirs and meso-groundwater sources. Vertical sails.

Summary. Hello <>

Freshwater refers to water with no or very little salt, which is an indispensable resource for human life and production. According to statistics, about seawater and only fresh water are used in the world's water resources. In this fresh water, there are glaciers, ice and snow, groundwater, and only surface freshwater, including rivers, lakes, wetlands, etc.

As a result, the world's freshwater resources available for direct human use are very limited and need to be more cherished and protected. <>

Fresh water accounts for less than that.

Hello <>

Freshwater refers to water with no or very little salt, which is an indispensable resource for human life and production. According to statistics, about seawater and only fresh water are used in the world's water resources. In this fresh water, there are glaciers, ice and snow, groundwater, and only surface freshwater, including rivers, lakes, wetlands, etc.

Therefore, the freshwater resources available for direct human use are very limited, and it is necessary to cherish and protect the slippery reeds more. <>

Kiss <>

Hello, according to statistics, in the world's water resources, about seawater, only freshwater. In this fresh water, there are glaciers, ice and snow, groundwater, and only surface fresh water, including rivers, lakes, wetlands, etc. As a result, the world's freshwater resources available for direct human use are very limited and need to be more cherished and protected.

I hope mine can help you