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Meteorites
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Most meteorites burn up quickly in the thermosphere, giving off a bright light, due to friction with the atmosphere. They are known as shooting stars.
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The formation of the Earth atmosphere
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In the beginning, our planet had no atmosphere. As the Earth cooled, various gases were produced. These gases formed the first atmosphere. Oxygen appeared when the first plants began to produce oxygen…
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Reflect. Pressure and climate 2
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Is the air pressure at the top of a mountain higher or lower than the air pressure at sea level? Explain your answer.
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Answer. The atmosphere 1
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What is the ozone layer? Why is it important for life on Earth?
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Answer. Water on our planet 4
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What percentage of the planet's surface is occupied by water?
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True/false. Metamorphic rocks
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Are the following sentences true or false? Metamorphic rocks come from the solidification of magma. Metamorphism is caused by changes in volume. Marble is formed from metamorphosed clay. In many…
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Answer. The simplest invertebrates 1.1
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Where do sponges live? Explain how they eat.
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Answer. Arachnids, myriapods and crustaceans 5.1
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What makes crustaceans' exoskeletons so hard?
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Final evaluation 06 - The Earth's surface: shaping human activity
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List and describe the main mountain ranges on the Iberian Peninsula:
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Answer. Treaties, declarations and organisations 02
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What is the reason for creating supranational organisations?
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