Where does water come from on Earth, and why is there so much of it?

On our home planet, Earth is just a huge amount of water. As a percentage, approximately 71% of the planet’s surface is occupied by seas and oceans, with an average depth of about 4,000 meters.

However, this is a very strange fact, because if you are guided by knowledge of the origin of the planets, the surface of the Earth should be dry, just like other dwarf planets in the solar system.

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According to the theory "On the origin of the planets"

Billions of years ago, a huge plasma ball scattered in all directions throughout the Universe, throwing out a large amount of highly heated matter. Over time, it cooled, forming cosmic dust. In the epicenter of the explosion began to form a star, which is now called the "Sun".

The gravitational force of our star began to attract the mother to itself, thus began to form "dust belts", the matter in which began to increase the temperature and energy, and as a result, shrink into planets.

It is important to understand that there could not be water on Earth from the very beginning. during the formation of the planet itself, matter was very hot, and all the water that is present in space in the form of ice would simply evaporate.

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From the bowels of the earth

With the formation of the Earth’s core, planets began to form on the planet, which, due to the temperature difference, began to differ in chemical composition. As a result, a separation into layers of oxygen and hydrogen appeared, which reacted to form water. Later on, volcanoes began to pour magma on the surface of the earth, along with huge clouds of water vapor.

Water accumulated for a long time in the atmosphere until the temperature of the Earth ceased to be more than 100 degrees Celsius. And from the very moment it cooled down to the required temperature, continuous rains and thunderstorms began, which filled more than 97% of the surface with water. True, at that time the depth was significantly lower than now.

Eruption of the volcano "Colima". Mexico.
Extraterrestrial sources

At the stage of the formation of the Earth, its surface was often attacked by meteorites and comets containing water in the form of ice.

They, in turn, were able to keep the liquid on their surface, due to the fact that they were at a great distance from the Sun, and the incoming energy was insufficient to evaporate the contained liquid.

These theories are the most probable, but there are still controversies among scientists about the adoption of one point of view.

Why is there so much water

In fact, water has been detected on other planets. For example, on the poles of Mars found a lot of liquid in the form of ice. Also on one of the satellites of Jupiter "Europe" there is an ice crust several kilometers thick. But water is only in the form of ice.

Venus and Mercury have practically no atmosphere, and they are too close to the Sun. Therefore, water has long evaporated from the surface of these planets.

The earth, in turn, has a convenient location, and the temperature here is optimal for the stay of water in all its three aggregative states. for the same reason, it has accumulated here more than on other planets.

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