Вопрос № 857112 - Английский язык

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Certain other substances absorb moisture from the air when they are exposed to it; these are said to be deliquescent. The impurities often present in common table salt are typical of this class of substances. Because these impurities tend to solidify upon absorbing moisture from the air the openings of a salt shaker clog in damp weather.
A substance that absorbs moisture from the air and becomes wet or dissolves in the moisture is called deliquescent.

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What is a crystal? A crystal is a 1_______ solid made by a natural process. Many substances absorb water from solutions when they crystallize; that is, they unite chemically with a definite proportion of 2_______. The water with which any substance unites during the process of crystallization is called the water of crystallization.
Certain 3_______ substances, for example, washing soda, give up their water of crystallization when they are exposed air; they are then reduced to 4_______. Substances that have this property are called efflorescent, and the process is called efflorescence.

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As the population increases, the problem of water supply in many desert regions becomes more urgent with every year.
Scientists consider that the best way to solve this problem is to construct plants that will use atomic energy to distill fresh water from the sea. It is believed that it will be cheaper to distill sea water than to make new freshwater reservoirs.

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1_______. When he was a child, he was not a very good student but he liked Physics very much. 2_______. The compass made him wonder about the connection between the needle and the north pole. Then, his interest in Physics increased even more. 3_______. In 1913, he became director of Physics in an institute in Berlin. In 1916, he published his Theory of Relativity which suddenly made him famous all over the world. It was difficult for Albert to prove his theories but in the end he succeeded. 4_______. He died in Princeton in 1955.

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What do we know about the sea? We all have distinguished it. 1_______. We know that it looks very pretty when the sun is shining on it. We also know that it can be less pretty when it is rough. What other things so we know about it?
2_______. Look at the map of the world. There is less land than sea. The sea covers three quarters of the world. The sea is also very deep in some places. 3_______. The highest mountain in the world is about nine kilometres high. The sea water is very salty. 4_______. Some parts of the sea are less salty than other ones. In most parts of the sea there are plenty of fishes and plants. Some live near the top of the sea. Others live deep down. The sea is full of wonders.

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The planet Mars has interested scientists for hundreds of years. 1_______. This sounds surprising, but astronomers say that there could have been lakes, rivers and seas on the surface of the planet. 2_______. In 1877, the Italian astronomer Schiaparelli was looking through his telescope at the planet, when he noticed that there seemed to be a network of canals on the planet. 3_______. When the Americans sent Mariner 4 into space, it sent back 21 photographs, which show that Mars is a cold, lifeless world. Therefore, we can conclude that people could not be living there now, although they might have done so in the past. In 1976, the photographs taken by Viking 1 were examined, and one of them showed a strange pyramid-shaped rock which could be taken for a human face. Was this a trick of the light or evidence that a great civilisation used to exist on the planet? 4_______.