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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. Sources of pollution 2
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What should industries and factories do to reduce the pollutants they release into the air?
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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. 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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Initial evaluation 3 - The Diversity of Life
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Match each organism with the kingdom it belongs to: mushroom moss mollusc bacteria protozoa
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Answer. Angiosperm plants D6
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What is the difference between the fruit of the cherry tree and the fruit of the chestnut tree?
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Reflect. Characteristics of fish 1.1
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Why do people fishing stay quiet while they fish?
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