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Did you know?...Coevolution
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Coevolution is the process of evolution where some plants and animals evolve in a way that affects another organism. Some animals have developed a part of their body to help them drink nectar from…
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Did you know?
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The mass of an object does not change when you move it from one place to another or take it to the Moon. But weight does vary, because the magnitude of gravity on Earth is not constant at 9.8 m/s2…
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Calculate. Forces and work
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¿What is the efficiency (expressed as a percentage) of a machine that performs work of 1190 J and 1400 J for it consumption? η = %
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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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Choose. The history of energy
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Choose the correct answer: What was the first source of energy for humans? Which machine ushered in the industrial revolution? What is the most important source of energy for the Earth, and not just for…
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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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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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18th century Spain: the Bourbon monarchy
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6.1. The War of Succession (1701- 1714) The last king of the House of Austria, Charles II, died childless. Shortly before his death, he appointed his great-nephew, the French Prince Philip of Bourbon,…
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Research. The Luncheon on the Grass
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Why do you think that this painting caused such controversy at the time it was painted?
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Europe at the beginning of the 20th century
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1.1. The spread of democracy During the 19th century, most of the industrialised countries established constitutional and parliamentary political systems (the separation of powers, houses of…