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Answer. Materials 03
EduBook Organización
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Give the names of three natural fibres and a piece of clothing you can make from each of them. Do the same with three artificial fibres.
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Final evaluation 1.8 - Matter and Materials
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- 1524 visitas
Describe the following properties of materials: Hardness Eelctrical conductivity Fragility Elasticity Do you know any other properties of materials? Describe one or two.
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Answer. Astral bodies 03
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- 1528 visitas
How are a comet's coma and tail formed? Why does a comet lose some of its mass each time it passes close to the Sun?
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The depletion of the ozone layer
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- 1526 visitas
In the 80s, a decrease in the thickness of the ozone layer over Antarctica was detected. This rate of decrease has continued. Scientists believe that the original concentrations of ozone will be…
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Answer. Pollution, the environment and health 3
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- 1530 visitas
What causes an increase in the natural greenhouse effect?
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Did you know?
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- 1525 visitas
When we want water, we just turn on the water tap and out it comes. But water is a very scarce resource. We should not waste or pollute water. Remember, more than 2 billion people do not have access to…
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Minerals (I)
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2.1. What is a mineral? Minerals are solid and inorganic substances which have a particular chemical composition. They are formed naturally. Minerals are characterised by their perfectly ordered…
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Final self-evaluation 03 - The Earth's Crust
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Are the following sentences true or false? The Earth's outermost layer is called the crust. Ocean trenches are long, narrow depressions in the floor of the ocean. The most common elements in the…
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True/false. The Earth
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- 1522 visitas
Are the following sentences true or false? Water on Earth exists in three different states. The size of the Earth has nothing to do with its capacity to sustain life. The atmosphere is essential for…
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Answer. The simplest invertebrates 1.2
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Compare and contrast the two different shapes of cnidarians.