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Analyse a photograph
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This photo shows an eruption of Mount Etna, in Sicily. Describe what you see in the photograph. Notice the lava flowing down the mountainside. What is it like? Do you think there could be any towns or…
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Talk about it. Obtaining and using energy
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Look at the pictures and answer the questions: Is the Sun a source of energy? And a bonfire? List five sources of energy. Which of them could run out? Will we always have oil to use? Name a source of…
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The need for energy. Sources of energy
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3.1. The need for energy through history In prehistoric times, human beings, who were nomadic hunter-gatherers, needed no other energy than fire to keep them warm and cook their food. Centuries later,…
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True/False. Work it out
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Copy only the true statements from the following list into your notebook and say why they are true: Coal and oil, as well as causing pollution, are running out and cannot be renewed. The water used in…
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Summaries - Heat and temperature
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1. Energy transfer: heat Heat or thermal energy is the energy that is transferred from hot bodies to cold bodies. All the particles that make up bodies have internal energy; the particles in a hot body…
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Check. Materials that conduct and insulate heat
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Remember what you have studied in this section and answer the questions: What are the three ways by which heat is propagated? Give one example of each. Does matter move in convection? And in radiation?…
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Think about it. The nature of light
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Remember what you have studied in this section and answer the questions: Look at the diagram of electromagnetic waves. State what happens to the wavelength, frequency and energy as you go from left to…
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Calculate. The nature of light (1)
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Calculate how far light travels in air in 20 s. In 20 s, light will travel .
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Match. Concepts of the birth of industry
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Match the definition with a concept: Machine invented by James Watt that burned coal and became a symbol of the Industrial Revolution. Textile imported from India that was later banned in order to…
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Describe. United States and the crisis of 1898
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Look at the illustration and answer the questions: What conflict is depicted in this cartoon? What caused it? Describe the characters and the action. Explain the symbolism. What do the teeth represent?