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Drinking water
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Drinking water is water we can consume without the risk of getting ill. Not all fresh water is drinkable. Water from rivers, lakes, reservoirs and aquifers may contain harmful substances. It may be…
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Complete. Chemical reactions
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Complete the text with the correct words: oxidation fermentation heat combustible products In chemical reaction, substances turn into the of the reaction. Sometimes is a product of the reaction. The…
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Summaries - Nutrition, breathing and circulation
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1. Nutrition. Food and nutrients Food enters our body through the digestive system. Food gives us energy to grow and repair our body if we are ill or hurt. We obtain important substances from food to…
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Fertilisers
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Fertilisers are mixtures of chemical substances, including many biolelements. They are used to enrich the soil and improve plant growth. They usually contain nitrogen, phosphorus, potassium and…
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Nutrition: food and nutrients
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Food Food enters our body through the digestive system. Food is important because: It gives us energy to do our daily activities. We need energy to grow, and to repair our body if we are ill or hurt. We…
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Final self-evaluation 1.7 - Matter and Materials
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Complete the following sentences with the missing words: Pure are made up of a single type of element, like iron, or compound, like , the of which do not vary. Substances made up of different elements…
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Check. The sense organs adapt
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Remember what you have studied in this section and answer the questions: What is a receptor? Where are they found? Match the five senses with their sense organs. Which receptors can detect chemical substances?
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Disadvantages of non-renewable energies
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5.1. Pollution of the environment The production, transport and use of nonrenewable sources of energy generates environmental pollution. Power stations, factories, vehicles and heating systems all emit…
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Answer. Matter and materials
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Answer the following questions in your notebook: What are the properties of matter? What are the two different types of substances? What are the four changes of state of matter? What is filtration? What…
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Matter and Materials
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All objects around us are made of matter. Matter is anything that occupies space. We find matter in three different states: solid, like ice, liquid, like water, and gas, like water vapour. We can make…
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