What kind of “reverse rains” have scientists discovered underground?

French geologists have presented a new look at the processes going on in the bowels of our planet. According to their theory, “reverse rains” seep from under the earth's crust to the surface, filling the ocean with water. The study was published in the journal Physics of the Earth and Planetary Interiors.

Scientists have long known that the water cycle in nbsp;nature occurs not only above the surface of the Earth, but and in   its depths. Water goes into mantle — the layer between the bark and kernel — during the movements of tectonic plates — and returns to as a result of volcanic eruptions or through geothermal sources. Thanks to this, the level of the World Ocean has remained relatively stable over the past 500 million years. If it weren't the Earth would look like an ocean-planet, then like a dried-up celestial body. The fact that the level of the world's oceans does not fluctuate significantly makes the planet habitable.

But it turns out that inside the Earth, within the first few hundred kilometers under the crust, there is another ocean. And, most likely, this is the largest ocean in the world. True, its contents do not splash in waves, and no one living creature lives in its waters. Yes and water is a big stretch  

Employees of the University of Clermont Auvergne (France) Denis Andro and Natalie Bolfan-Casanovadeveloped a new geological model. According to her, there is much more water in the bowels of the Earth than previously thought. When solid rock in the mantle is saturated with chemically dissociated water, it turns into a kind of molten suspension. This mixture eventually becomes light enough to begin to rise and seeps back towards the earth's crust. The researchers called it “mantle rain” (mantle rain).

“Imagine a mushy mixture of grains of sand that are glued to each other with dirt between them. This dirt is  there is mantle rain», — they say. Reaching the upper layers of the mantle, the water binds with the minerals contained in it, which reduces the temperature of their melting and releases even more water.

According to the authors of the theory, the layer saturated with a huge amount of water is at a depth of 410  ; kilometers. To find it, the scientists analyzed what happens when a slab of rock sinks deeper and deeper into the mantle. So it turned out that as it lowers, the temperature and pressure increase, the rock melts, as a result of which water is released, and there is the same "reverse rain".

In  geologists prove that this “rain” enough to maintain the balance of the water cycle in the bowels of the planet. But more work is required to understand all the details of this process.

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