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Did you know?
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The blue whale is the largest animal that has ever lived on Earth; it can measure over 30 m and weigh up to 130 tonnes. When a blue whale calf stops drinking its mother's milk, it measures 15 m.…
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Choose the correct answers. Terrestrial ecosystems
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Choose the correct answer: What amount of rainfall is usually experienced in the steppes? What crops can be found in the steppes? The terrestrial ecosystem that looks different in each season is .. The…
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Matter is recycled and energy is lost in ecosystems
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When living things die, decomposers use the organic material to obtain energy. In doing this, they turn the organic biomolecules into inorganic material again. The action of decomposers closes the cycle…
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Think about it. Trophic relationships in ecosystems
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Remember what you have studied in this section and answer the questions: Are feeding relationships intraspecific or interspecific? Explain your answer. Why can there only be four or five trophic levels?…
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Learn. Risks from volcanoes - Energy inside the Earth
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Volcanic eruptions can cause loss of human life and material damage. This can be because of the material ejected from the volcano or as a consequence of the seismic activity which usually accompanies…
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Internal geodynamics and surface relief
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The forces inside the Earth cause mountain chains to form They also deform rocks and form folds, or break rocks and cause geological faults or joints. 6.1. Mountain ranges Mountain ranges are chains of…
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Energy transfer: heat
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1.1. Heat The particles that make up matter store energy: Heat or thermal energy is the energy that is transferred from hot bodies to cold bodies (figure 1). All the particles that make up bodies have…
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The reflection of sound
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7.1. Reflection of sound Sound is transmitted in a straight line. When it meets obstacles that it cannot cross, like a wall or a rock, it is reflected back in the other direction. Two phenomena caused…
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Look. A 19th century textile factory
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Look at the illustration. What type of scene does it show? Who or what is the protagonist? What are the women doing?
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Interpret. Emigrations to America
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Look at the graph and answer the questions: Which regions lost more population? What do those regions have in common? Where did the majority of emigrants come from? Where did they emigrate to?