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Light and sound
EduBook Organización
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We perceive most of the things around us because we can see or hear them. Most objects do not have their own light. We see them because they are illuminated by light from natural and artificial sources,…
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Check. Test yourself
EduBook Organización
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Remember what you have studied in this unit and answer the questions: Why is it easy to compress a gas, but not a solid? What is the difference between chemical elements and chemical compounds? Are…
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Finding out about our past
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Our family album You can discover what happened many years ago in your family, before you were born. If you look at photos in an old family album, you will see that your parents, grandparents and…
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Compound machines
EduBook Organización
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What are compound machines? Compound machines are made up of various simple machines. Scissors, pliers, gears, bikes and cars are examples of compound machines. Pliers Pliers are made up of two levers…
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Festivals and traditions
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Festivals We have festivals on different days during the year. When there is a festival, people have fun with their family and friends. The life of farmers, who grow plants and keep animals for food,…
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Arthropods
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Characteristics of arthropods Arthropods are the largest animal group on Earth. The most characteristic feature of arthropods is their external skeleton. The articulated exoskeleton (external skeleton)…
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The five groups of vertebrates
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Fish have an elongated body and swim using their fins. Amphibians live part of their life in water. Their skin is moist and slippery. Reptiles crawl to move around. Their bodies are covered with hard…
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A country governed by property owners
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We must be governed by the best, the best are the most educated and most interested in keeping the laws. However, with few exceptions, the only men with these features are those who have property, who…
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Check. A bomb shelter during the civil war
EduBook Organización
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Remember what you have studied in this section and answer the questions: Look at the drawing of the bomb shelter and visit www.tiching.com/98332Identify the parts of the shelter, how they were built,…
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Check. Liberalism and nationalism
EduBook Organización
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Remember what you have studied in this section and answer the questions: Match each role with a branch of government: makes laws, executes laws, ensures compliance with the law. What rights do citizens…