Why did some ancient cities end up under layers of earth and where did it come from? Detailed answer

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Why did some ancient cities end up under layers of earth and where did it come from? Detailed answer

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Why did some ancient cities end up under layers of earth and where did it come from?

The reason for the burial of some ancient cities (as well as many other creations of human hands) under the layers of the earth are several factors acting, as a rule, together.

One is windblown dust, ranging from ash from volcanic eruptions to ordinary household dust. Accumulating for a long time, layers of this dust hide various objects under them.

Another factor is the deposits of sand or clay formed by water flows - river, rain, mudflows, as well as floods.

Hills often form over adobe settlements. Short-lived (on average, about 60 years) buildings, collapsing, serve as the basis for new ones, and the settlement grows in height.

This process, combined with the accumulation of waste, is capable of bringing a hill (tell, or tepe) to a height of 30 meters or more.

Author: Kondrashov A.P.

Random interesting fact from the Great Encyclopedia:

What is rheumatism?

Rheumatism is a disease associated with inflammation of the joints of the body. If this disease is not controlled, then the person's condition worsens and in the end he can become disabled. The disease begins with inflammation of the film lining joints such as the knees, elbows, and hands. At the same time, cartilage is also affected, and changes occur even in the bones. The bone loses some minerals and becomes porous. The joint becomes inactive and sometimes even completely unable to move. Although there are a significant number of theories about the causes of rheumatism, none of them has been proven.

According to one theory, rheumatism appears as a result of an infection, which can occur in three ways: due to bacteria penetrating the joints along with the blood, due to toxic substances that appeared as a result of some other infection, or due to an allergic reaction of the joint to what are microorganisms.

Some doctors believe that certain types of people are much more at risk of developing rheumatism than others. These can be people aged twenty to forty years of fragile physique, not very strong, easily tired. When the disease is just beginning, a person usually develops fever, pain, swelling in one or more joints. The patient complains of fatigue, loses weight, and experiences numbness and tingling in the legs and arms.

One of the signs of the disease is a feeling of warmth, pain and swelling of the middle joints of the fingers. Sometimes even the movement of the fingers causes pain. In other cases, the rest of the body is affected: joints in the hands, toes, wrists, knees, elbows, shoulders, and hips. Almost any joint can become a victim of this disease. Since we do not know the causes of this disease and it can develop and proceed differently in different people, there is no specific method of treatment that would help in all cases. In each case, individual treatment is determined.

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