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Pure substances: elements and compounds
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3.1. Pure substances and mixtures Pure substances are substances which have a fixed composition and properties which allow us to identify them. Mixtures are made up of two or more pure substances. 3.2.…
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Matter, materials and measuring
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What is matter? All the objects around us, including all living and non-living things, are made of matter. Matter is everything that has a weight and a volume. The quantity of matter that an object has…
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The Solar System
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The Solar System is made up of all the celestial bodies that are affected by the Sun's gravity. The most important of these are the planets. Planets Planets are large, round celestial bodies that…
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Activities - Plants
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Plants are living things. They live in different places. Plants need water and the Sun to grow. They use the water and the light from the Sun to make their own food. Plants reproduce by making seeds.…
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Check. Light and colours
EduBook Organización
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Remember what you have studied in this section and answer the questions: What are the three primary colours of light? Why are they called this? What are the three primary colours of pigments? What do we…
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Mountain landscapes
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Mountain landscapes Mountains are high elevations of land. A mountain has three parts: The peak is the highest part of the mountain. The foot is the bottom part of the mountain. The slopes are the parts…
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Ocean dynamics
EduBook Organización
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3.1. How oceans and seas move The water in oceans and seas is always moving because of waves, tides and ocean currents. Waves Waves are caused by wind moving the water on the surface of the sea. The…
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Blood circulation (II)
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The heart The heart is the organ that pumps blood to all the cells in our body. It is about the size of a closed fist. Its walls are made of muscle tissue. The heart contains four chambers: The two top…
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Answer. Unicellular and multicellular organisms
EduBook Organización
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Remember what you have studied in this section and answer the questions: What are organisms made up of a single cell called? How do they reproduce? What do we call living things that are made up of many…
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The city as an ecosystem - Cities and Urban Areas
EduBook Organización
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An ecosystem is an area where living things interact with each other and their physical environment. A city is considered to be an ecosystem as many interactions are constantly taking place. Resources…
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