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Investigate - Heat and temperature
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Heat or thermal energy is the energy that a body transfers to a colder body at a certain temperature. Thermal energy is involved in many processes in our daily life, like cooking food, making a hot…
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End-of-unit evaluation - Heat and temperature
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Heat or thermal energy is the energy that a body transfers to a colder body at a certain temperature. Thermal energy is involved in many processes in our daily life, like cooking food, making a hot…
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Activities - Work
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People need to work to live. We receive money for the work we do so that we can buy the things we need. Jobs help society to function well. There are many types of jobs. Some people produce food or raw…
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Remember - Energy
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We need energy to move. Humans get energy from food. Machines get energy from petrol or electricity. The Sun is a natural source of energy. We call the Sun a renewable energy source because it is…
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Analyse. The Sun's energy affects the activity of living things
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The Sun's energy affects the activity of living things Living things need energy for their life processes. In the case of animals, in winter, the cold and lack of food, due to the slowing down of…
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Air and life
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We need air to breathe Humans and other animals that live on land need air to live. When we breathe, we take oxygen from the air. With this oxygen and with the food we eat, our body has the energy it…
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The 'Roaring Twenties'
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1.1. The United States of America the world's leading power While the First World War had been an economic disaster for Europe, the United States benefited enormously from the conflict. By supplying…
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Complete. The role of vegetation in the ecosystem
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Choose the correct option to complete these sentences on the role of vegetation in the Earth's ecosystem: Vegetation is at the of the relationships in the Earth's ecosystem. It depends on the…
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Answer. Human reproduction
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Remember what you have studied in this section and answer: What is a zygote? How is it formed? What is fertilisation? What route do sperm follow from when they leave the testicles to the moment they…
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Energy
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What is energy? Energy makes objects move. It can also make objects change temperature or shape. Machines need different types of energy. For example, cars need petrol or diesel. We call these energy…
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