Has there been global warming before? Detailed answer

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Has there been global warming before? Detailed answer

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Has there been global warming before?

There have been, more than once. For example, from 800 to 1300, the average temperature on Earth increased by 1,5%, part of Greenland was freed from ice.

300 years ago there was a "Little Ice Age" when the average temperature in the Northern Hemisphere fell by a full degree.

Author: Mendeleev V.A.

Random interesting fact from the Great Encyclopedia:

Who is a swordsman?

The horseshoe crab is a very interesting creature. To begin with, although it is called "king crab" in English, it is not a crab at all, although it is a relative of crabs and spiders. Its scientific name - Limulus Polyphemus - alludes to its amazing eyes. This animal has four eyes. Two eyes protrude from the sides, and two more are set very close together on the front of the head and almost merge into one eye, similar to the one that Polyphemus the Cyclops had in ancient Greek myth. Scientists call horseshoe crabs "living fossils". The body of the polyphemus has changed very little over the millions of years of its existence. Imagine, they exist in this form for almost two hundred million years!

The entire body of the horseshoe crab is protected by a thick shell. Its long and pointed tail resembles a sword. This sword is serrated. When the horseshoe crab turns over in a wave, it uses its tail to assume a normal position. The horseshoe crab has six pairs of legs. He uses four pairs to move along the sandy bottom of the ocean. And a strong back pair of legs - in order to push off the bottom and swim. With short front paws, he also pushes food to his mouth. The mouth is almost completely hidden among the legs used for walking, so it is difficult to see it. Its "shoulders", or the inner joints of its paws, resemble real tongs. With their help, he grinds his prey before putting it into his mouth.

Horseshoe crabs feed on almost everything, from small clams, worms and fish eggs to algae and decaying organisms. Horseshoe crabs breathe with flapped gills. In each leaf there are about one hundred and fifty thin plates, with the help of which it consumes oxygen dissolved in water. As long as these plates remain moist, the animal can breathe. Horseshoe crab cubs hatch from small eggs, appearing without a tail and with a very soft shell.

After four weeks, they grow out of their shells, which do not grow with them. The animal must shed this shell, that is, shed. Until the horseshoe crab reaches its full height, from thirty to sixty centimeters, it can change its shell up to twenty times!

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Random news from the Archive

Boron discovered on Mars 16.09.2017

Mars rover Curiosity found boron in rocks on the Red Planet. The presence of this chemical element on Mars theoretically increases the likelihood of the birth of terrestrial life on the planet.

Curiosity found boron in a calcium sulfate mineral vein in Gale Crater. This means that boron was present in Martian groundwater. It has already been established that the groundwater in this place once had a temperature of 0-60 ° C and was a neutral or slightly alkaline environment in terms of Ph level (which is also quite suitable for the existence of life).

The discovery was made using the scanning laser ChemCam (from the words "chemistry" and "camera") mounted on the rover, created jointly by scientists from Lo Alamos and the French Space Agency.

Boron plays an important role in stabilizing the polysaccharide structure of RNA (ribonucleic acid), one of the key molecules found in all living organisms. Working in conjunction with DNA, RNA ensures the reading of information encrypted in genes and the synthesis of proteins based on it, and this is the basis of the life and development of any living being.

Thus, the presence of boron on the Red Planet theoretically increases the chances that life could once have originated there.

Boron compounds are one of the possible "bridges" between simple organic molecules and RNA. Without RNA, there is no life. The presence of boron tells us that if there was organic matter on Mars, such chemical reactions could occur.

It is noteworthy that the age of the deposits in which boron was discovered is estimated by scientists at 3,8 billion years. This is later than, according to modern ideas, life originated on Earth.

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