Прочитайте текст и найдите соответствующий перевод подчеркнутого слова. There are billions of stars ...: ответ на тест 1072219 - Английский язык

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There are billions of stars in the universe. Stars are massive, energy-filled globes of fiery gases. The force of gravity holds these gases together. At a star’s core, atoms of hydrogen join together to form helium in a process called nuclear fusion. The energy generated by this process produces a star’s heat and light. Collections of stars are called galaxies, and each galaxy contains many different types of stars.

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The Universe contains everything that exists – not only the 1_______ and everything on it, but also all the planets, stars, and galaxies, and the space in between them. The sun, at the center of the solar system, is just one of about 100 billion stars in our galaxy, or collection of stars, called the Milky Way. 2_______ have estimated that there are about 100 billion other galaxies in the universe. Most scientists 3_______that the universe formed about 15 billion years ago in an enormous explosion called the big bang. They also think that 4_______ is expanding.

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Compound is a substance in which the atoms of two or more elements are joined together by chemical bonds. Because of these bonds, it is very difficult to split a compound into its individual elements. The type and number of bonds formed depend on the electrons (particles with a negative electrical charge) in each atom. The properties of a compound can be very different from those of the elements it contains. For example, the salt we use in our food is a harmless compound, yet it is made up of two dangerous elements – sodium, which reacts violently with air, and chlorine, which is poisonous in large quantities.

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A chemical reaction occurs when substances change into new substances. For this to happen, the bonds between atoms and molecules must break and re-form in different ways. Because the bonds can be strong, energy, usually in the form of heat, is often needed to start a reaction. The new substances have properties different from those of the original substances. Chemical reactions do not occur only in laboratories; they happen all around us – for example, when cars rust and when food is cooked.

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The Italian physicist Alessandro Volta was a pioneer in the development of electricity. 1_______. His work impressed the French leader Napoleon Bonaparte, who made him a count. 2_______. Volta also studied the properties of air. 3_______. This work was largely ignored, and the same idea was later advanced by others. 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_______.