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Las consecuencias de la guerra
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4.1. Los tratados de paz En enero de 1919 se inauguró en París una conferencia para establecer las condiciones de paz. Asistieron 32 países, pero las decisiones fueron tomadas por las cuatro grandes…
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La comunicació: definició i elements
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La comunicació: definició i elements La comunicació. Les funcions del llenguatge
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Check. The leaves make the food for the plant
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Remember what you have studied in this section and answer the questions: In which cells do the following functions take place: photosynthesis, gas exchange, transport of nutrients, absorption of light?
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Analyse. A text
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Polyembryony Polyembryony is a type of sexual reproduction in which an embryo fragments into several identical embryos. They each develop independently. The young of each litter are of the same sex, as…
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True or false. States of matter
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Answer true or false: The particles are less tightly bound together in a solid. The particles in a gas move very quickly. All systems are composed of material particles. Liquids are compressed and…
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Check. Mass and weight
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Remember what you have studied in this section and answer the questions: What is gravity? Where do we see examples of the force of attraction between bodies? Discuss.
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Calculate. Pressure
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Calculate the pressure exerted on snow by the feet of a man with a mass of 81 kg if you know that the total surface area of the soles of his boots is 0,6 m2? Note: g = 9,8 m/s2. P = Pa
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Choose. Upthrust and buoyancy
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Choose the correct answer: What equals the upward thrust experienced by a submerged object in a liquid? What is the apparent weight of an object? What happens if the weight is less than the upward…
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Think about it. Sound
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Remember what you have studied in this section and answer the questions: Why do we say that sound transports energy? What kind of energy is it? If we put our ear close to a railway track, we know that a…
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Interpret. Coal and steel production
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How did the production of coal and steel grow? Interpret the graphs. → from...to..., rose steadily/gradually/sharply...,
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