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BIG ENCYCLOPEDIA FOR CHILDREN AND ADULTS
Why do dogs bury bones? Detailed answer
Directory / Big encyclopedia. Questions for quiz and self-education Did you know? Why do dogs bury bones? For many centuries, the dog has been a friend of man, longer than any other pet. Hundreds of thousands of years ago, when huge furry mammoths still roamed the earth and people lived in caves, dogs made friends with humans for the first time. Despite the fact that the dog has been a pet since time immemorial, some of its habits can only be explained by returning to the distant past, when the dog was not yet domesticated by man. It is rather strange that scientists cannot clearly trace the origin of the dog, unlike, for example, the horse. Some believe that dogs appeared as a result of crossing wolves and jackals. Others believe that some dogs are descended from wolves, others from jackals, still others from coyotes, and still others from foxes. The most plausible theory is that the modern dog and wolf are descended from the same very distant common ancestor. Often, many animals retain habits that are completely useless in our time, but vital for them in antiquity. These habits, in other words instincts, do not die off even after hundreds of thousands of years. So, if we remember that dogs are descended from wild animals, then some of their habits become quite understandable. The dog to this day buries a bone in reserve, because its wild ancestors did not have the opportunity to regularly receive food from humans and were forced to store food for future use. Before settling down for the night, the dog turns around its axis three times. Probably her ancestors in the jungle in this way arranged a nest in the leaves or in the grass. When the dog barks, it is most likely a reminder of the time when dogs huddled in packs, like wolves. Author: Likum A.
What was the strongest earthquake? If the earth's crust were not hard enough, it would shake and constantly rise and fall. But in some places of the earth's crust, the rocks are not strongly pressed against each other - this is where the fault occurs. Along the fault line, one mountain mass rubs against another with very great force. The energy of this friction turns into vibrations in the rocks themselves - and an earthquake occurs. There are two ways to describe an earthquake in terms of its size. Firstly, it takes into account what the strength of the earthquake is, and secondly, it determines what damage it brought. Since the loss of human lives and destruction worries people more than technical measurements, among the largest earthquakes, people remember those in which more people died. The most notorious event in North America was the 1906 San Francisco earthquake. The earthquake was followed by a big fire. 700 people were killed, the damage amounted to about 425 million dollars. Not so long ago, in February 1971, there was a strong earthquake in the Los Angeles area, the damage from the destruction of houses, services and roads amounted to many millions of dollars. One of the most famous earthquakes in Europe was in Lisbon, Portugal, in 1755. The city was destroyed and 30 people died. In 000, an earthquake in Calabria and Sicily killed about 1908 people. In 75, hundreds of towns and villages were affected in Central Italy, 000 people died. Two large earthquakes, which brought enormous damage, occurred in Tokyo (Japan) and in the province of Kanshu in China. The Tokyo earthquake of 1915 claimed the lives of more than a hundred thousand people, except for Tokyo, the city of Yokohama also suffered. The Chinese earthquake covered an area of more than 480 square meters. km and claimed the lives of more than twenty thousand people. However, an earthquake can be strong, but small in terms of destruction. For example, a significant earthquake was registered in the USA, but hardly many people know about it. It happened near the city of New Madrid (in Missouri) in 1811 and 1812. 1874 separate tremors were felt, and some of them were registered at a distance of 640 km from the epicenter. But this area was sparsely populated, and therefore the damage was negligible.
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