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Explain. Atoms and molecules 01
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- 1731 visitas
Does oxygen have molecules? What are they like? Does water have molecules? Compare them.
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Did you know?
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- 1726 visitas
Oil comes from the decomposition of the remains of microscopic organisms that lived millions of years ago. Oil is the most important natural material for industrial development. It is used to make…
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Final evaluation 1.8 - Matter and Materials
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- 1727 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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Converting units
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- 1729 visitas
A bronze statue has a mass of 0.6 tonnes. If we want to express it in kilograms, we need to make the following conversion: If a seed has a mass of 18 milligrams and we want to express it in grams, we…
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Calculate. Distances in the Universe 3
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- 1728 visitas
If the distance between the Earth and the Sun is 150000000 km, how many light minutes separate them? min.
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Choose. The Solar System
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- 1721 visitas
Choose the correct answer to each question: What is there between Mars and Jupiter? Where does the geocentric theory say that the Earth is located? How are the orbits of planets different from those of…
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Answer. Astral bodies 03
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- 1734 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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Match. Weather forecast
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- 1729 visitas
Match the concepts in each column: anticyclone cyclone difference in pressure equal atmospheric pressure
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Calculate. Minerals (1)
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- 1732 visitas
The sea provides us with many minerals. If a tonne of seawater is needed to extract 0.5 mg of gold, calculate how many tonnes are needed to extract enough gold to make a 30 g ring. Result: tonnes
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Final evaluation 1 - The Earth's Crust
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- 1732 visitas
What is the difference between the Earth's continental crust and its oceanic crust?
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