Вопрос № 1072616 - Английский язык

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1_______. This system was first developed in India in the 3rd century BC. 2_______.
The important innovation in the Arabic system was the use of positional notation, in which individual number symbols assume different values according to their position in the written numeral. 3_______. The symbol 0 makes it possible to differentiate between 11, 101, and 1,001 without the use of additional symbols, and all numbers can be expressed in terms of ten symbols, the numerals from 1 to 9 plus 0. 4_______.

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The Earth is one of nine planets that travel around the sun in the solar system. 1_______. It is the only planet known to support life. 2_______. At first this mass was very cold. 3_______. Heavy metals collected at the center and rocks floated near the surface. After millions of years, the rocks formed a hard crust. 4_______.

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The Greek mathematician Euclid worked in Alexandria, Egypt, 2300 years ago. 1_______. But he is famous for writing Elements, a series of 13 books. 2_______.In fact, these books were so clearly written that updated versions were still in use in schools in the early 1900s. 3_______. Mathematician and physicist Albert Einstein later proved that Euclid’s geometry was not valid throughout space and time. 4_______.

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Electricity and magnetism combine to form one of the fundamental forces of the universe – electromagnetism. The two constantly interact, and the relationship between them is one of the most important in physics. For example, an electric current passing through a wire creates a magnetic field; and if the lines of force around a magnet are cut by passing object, an electric current will be produced.
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Electricity and magnetism combine to form one of the fundamental forces of the universe – …

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Magnets are attracted to iron and to any material that contains iron. Magnets have two poles, a north pole and a south pole. Unmagnetized iron and steel have magnetic regions of atoms called domains that are jumbled up and point in lots of different directions. When iron or steel becomes magnetized, the domains become aligned and they all point in the same direction. One end of each domain points toward the magnetic north pole.
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Magnets are attracted to iron and to any material that contains …

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The related movements on the Earth, the moon, and the sun provide us with our marks of time. A full day and night is the time taken for the Earth to complete one turn on its axis. The time taken for the moon to orbit the Earth is one month. The Egyptians were the first people to measure time, about 5000 years ago. They divided their days into two periods of twelve equal hours, as we do today. The first timepieces included sundials and other clock forms that measured the changes in levels of water or sand. These were inaccurate, and it was not until the 1600s that the more reliable pendulum clock was invented by the Dutch scientist Christian Huygens.
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The Egyptians were the first people to …