Прочитайте текст и определите какой из заголовков соответствует тексту An atom a basic unit of matte...: ответ на тест 782659 - Английский язык

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We know that an atom is made from protons and neutrons in a nucleus, and electrons spinning around this nucleus. The protons have a positive electric charge and the electrons have a negative electric charge. The neutrons have no electric charge. As the electrons spin around the nucleus, they produce small currents. These currents create a magnetic field around the electrons and the atom. This magnetic field makes the atom behave like a small magnet.

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A basic law of electricity states that like charges repel each other and unlike charges attract each other. Electrons emitted from the cathode of an electron tube are negative electric charges. These charges may be either attracted to or repelled from the plate of a diode tube, depending on whether the plate is positively or negatively charged.

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The energy contained in atoms and molecules makes them vibrate and this vibration produces heat. Matter expands with heat. In an iceberg (solid matter), for example, the molecules absorb radiant energy from the sun and vibrate even more. Their temperature increases, they expand and form water (liquid matter). The molecules in the water vibrate until they evaporate and go up in the air (gaseous matter). When the temperature decreases, their vibration slows down and they condense into drops that fall as rain. Water is a liquid composed of two gases: oxygen and hydrogen.

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In a gas atom like hydrogen, when the vibration increases the heat makes the atom expand more and lose its electron. The hydrogen atom becomes two separate charged particles: proton (+) and electron (−). Each of these particles is called plasma – a positive plasma and a negative plasma.
Plasma is not only produced by heat but also by particles bombarding the atoms. We can find plasma produced by heat in the sun, and plasma produced by particles bombarding the atoms in the ionosphere. We can also find artificial plasma during electric welding and inside fluorescent lamps.
Interstellar space, the stars, and most of the universe is plasma. our planet is a tiny mass in a sea of plasma.

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In a star there are two main forces: expansion and gravity. In a blue star, when the force of gravity is stronger than the force of expansion the star collapses at its centre. The, the pull of gravity from the centre of the star is so strong that it even swallows the light! This makes the star invisible: a black hole. Around each black hole there is an area called event horizon which emits radiation. There is a black hole at the centre of our galaxy.

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It is a rather new city. The city is situated on the left bank of the Potomac River, between the states Virginia and Maryland. Its population is about three million people. It was named after the first president of the country.
It is one of the most beautiful  cities in the USA. It is famous for its cherry trees. They were brought there in 1912 as a gift from Japan.