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ussr

Former nation extending from eastern Europe E across Siberia to the Pacific Ocean. In the N it bordered on the Arctic Ocean and in the S on China, and on southwestern Asian countries. The USSR, successor to the Russian Empire, was the world’s largest nation in area and was third in population. It co... read more

electricity and magnetism

Electricity and magnetism are everywhere. Electricity is a form of energy. Magnetism is also a form of energy. They make it possible for televisions, computers, and many other electronic devices to exist. Medicine uses them to help treat illnesses in humans and animals. ... read more

the human body organs and systems

Your body is like a complex machine. Many parts make up your body and work to keep you going. Some parts, like your eyes and hands, are easy to see. Some parts, like your vocal cords, hide inside your body. When you hum, the vibrations you feel are your vocal cords at work. Some parts of the body are ... read more

compounds, acids and bases, mixtures, and solutions

Every material is made of either a pure substance or a combination of substances. A substance is pure if it contains only one type of element. An element is a substance made up of all of the same type of atoms. Oxygen is a pure substance. It only contains oxygen atoms. Elements combine in several ways... read more

how does chlorine clean swimming pools

The chemical reaction that stops swimmers from getting sick. ... read more