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The Earth's water is broken down into hydrogen atoms by the sun's ultraviolet rays, and then reaches its first cosmic velocity at high altitudes, escaping the Earth. But there is no need to worry at all that there will be less and less water on the planet. There are 10,000 cubic kilometers of water in the Earth's atmosphere, which accounts for 1/100,000 of the Earth's total water.
In atmospheric water, the top, i.e. the beginning of the stratosphere. In the troposphere, with an average thickness of about 12 km, about 75% of the atmosphere and more than 90% of the water vapor mass are concentrated. It rises to an altitude of 50 kilometers and is the stratosphere, in which the total water content is about 5% of the total water in the atmosphere, about 650 tons.
And the water content is also higher and lower as you go down. Further up, the middle layer (between the top of the stratosphere and 85 km) is largely devoid of moisture. The Earth's water is broken down by the sun's ultraviolet rays, mainly above the ozone layer, because the ultraviolet rays in the sun's rays are basically filtered out by the ozone layer in the atmosphere.
The ozone layer is at an altitude of 20-25 kilometers above the ground, in the stratosphere. Analyze it, first look at the hydrogen atom measured in **. "The probe photographed the Earth from an altitude of 1,500 kilometers and captured the diffusion of hydrogen atoms.
The concentration is extremely thin, averaging less than one atom per cubic centimeter, and the distribution shape is distorted spherical under the influence of sunlight. "The hydrogen atom is constantly spreading outward, and when it reaches a high-temperature layer with scarce air 80 to 100 kilometers above the surface, the hydrogen atom moves faster than the cosmic velocity and breaks away from the Earth's gravity into outer space, so the surface water runs into space. That is, water is broken down in the upper atmosphere, where there are only a few hundred tons of water.
One is that this water cannot be completely decomposed. The second is that the proton in the solar wind combines with any free electron, which is the hydrogen atom. Who can be sure that this hydrogen can only come from the decomposition of the Earth's water, and not from the solar wind captured by the Earth's magnetic field?
Even if all this hydrogen comes from the decomposition of water on earth by ultraviolet rays, it is only tens of thousands of tons, at most only hundreds of thousands of tons. And the water on Earth is not only lost, but also replenished. Recently, scientists from a research team at the University of Iowa in the United States found that there are always some small black spots on disk-shaped images of the Earth from thousands of ultraviolet radiation images of the Earth's atmosphere sent back by artificial satellites.
Each small dark spot lasts for about 2-3 minutes and covers an area of about 2,000 square kilometers. After analysis, the spots were caused by small comets made up of some invisible ice blocks that rushed into the Earth's atmosphere, rupturing and melting into water vapor. Scientists estimate that about 20 small ice-like comets with an average diameter of 10 meters enter the Earth's atmosphere every minute, each releasing about 100 tons of water.
Do the math, how much water do these small ice comets bring to Earth each year? Hundreds of millions of tons every year! It's no wonder that scientists have found that the Earth's sea level has risen by about 100 meters in 200 million years.
In other words, the water on the earth has not decreased, but has increased a lot. So, there is no need to worry about the water on the planet going to be less and less. On the contrary, there will only be more and more water on Earth over the next few hundred million years.
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