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automatic elevators begin to appear as early as the 1930s their development being hastened by striking elevator operators whits brought large cities development on skyscrapers (and therefore their elevators) such as new your and chicago to their knees. these electromechanical systems used relay logic circuits of increasing complexity to control the speed, position and door operation of an elevator or bank of elevators.
the otis autotronic system of the early 1950s brought the earliest predictive system which could anticipate traffic patterns within a building to deploy elevator movement in the most efficient manner. relay-controlled elevator systems remained common until the 1980s and their gradual replacement with solid-state, microprocessor-based controls are now the industry standard. most older, manually-operated elevators have been retrofitted with automatic or semi-automatic controls.

My name is Liza. I’m 11 years old. I’m from Orenburg. I have got a magnet collection. I think it is great. My collection has got forty magnets. My favourite magnets are from Britain. There are magnets from Russian cities, France, America, Canada and Turkey. I’m proud of my collection.

Меня зовут Лиза. Мне 11 лет. Я родом из Оренбурга. У меня есть коллекция магнитов. Думаю, она классная. В моей коллекции 40 магнитов. Мои любимые магнитики из Британии. Есть магниты из русских городов, Франции, Америки, Канады и Турции. Я горжусь своей коллекцией.

Объяснение:

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Environment - a set of components of the environment, natural and man-made natural objects and man-made objects.
Components of the environment - land, minerals, soils, surface and ground water, air, flora, fauna and other organisms, as well as the ozone layer of the atmosphere and near-Earth space, providing a set of favorable conditions for the existence of life on Earth.
Pollution - into the environment of matter and (or) energy, property, location or number of which have a negative impact on the environment.
Contaminant - a substance or mixture of substances, the number and (or) concentrations exceed established for chemical substances, including radioactive and other substances and microorganisms standards and have a negative impact on the environment.
Air pollution - a really serious problem. Air is composed of oxygen, nitrogen, water vapor, and, thanks to our civilization, of a variety of toxic particles. The more of these particles in the air is, the less room is left in the atmosphere for oxygen.
   The problem of air pollution is not limited to the space outside. The air inside our homes and offices can be as dangerous to your health. The main source of pollution - cigarette smoke, but it is not the only one. Toxins are allocated even when you just cook. Every time you scratch the Teflon non-stick coating is allocated enough toxins to kill a canary.
 Greenhouse effect, which we all have been associated with the phenomenon of global warming, caused by toxic gases. The main enemy of clear atmosphere - methane. It is released from the decomposition of sewage.
Greatly affects our waterways. In every neighborhood, in every city there drain sewer, storm water from the highways and municipal enterprises directly into the river. Everything goes into the water, passing minor cleaning steps.