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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

people who study physics

Physics is about how things work. People who study physics are called physicists. They learn about light and sound. They learn about electricity and magnetism. They learn about force and energy. They learn about how everything works, from the tiniest atom to the vastness of space. Physicists study man... read more

habitats

Life on Earth is delicate. There needs to be a balance between the environment and living things. A habitat is where certain types of animals and plants usually live. Some habitats are as small as the shade under a rock. Most habitats are larger areas. They may contain many species of plants and anima... read more

inside a serpent

No legs? No problem! Check out the science beneath the snakeskin. ... read more

what is an animal

Animals are living creatures. They include very small creatures such as dust mites and very large creatures such as whales. Animals are multi-cellular organisms that eat food to survive. They cannot get energy from the sun like plants do. Most animals can move on their own. ... read more