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Test the properties of air
EduBook Organización
4402 visitas
What is air? Air is a mixture of gases. It forms the atmosphere around us. Air is made up of two main gases: nitrogen and oxygen. It also has other gases, including water vapour and carbon dioxide.…
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Podcast: Casual Phone Conversation
Tiching explorer Organización
2 lo usan

6284 visitas
This podcast reproduces an informal dialogue between friends using slang to talk about the weekend. We learn expressions such as "what's up?", "what are you up to?", "hit the…
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Check. Test yourself
EduBook Organización
3716 visitas
Remember what you have studied in this section and answer the questions: What is the difference between binary fission and budding? What types of asexual reproduction are often seen in plants? How do we…
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Find out more
EduBook Organización
3669 visitas
Energy can be converted from one form of energy to another. For example: Electrical energy is converted into heat energy by heaters and cookers, and into light energy by lamps. Electrical energy can…
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Adverbs - Understanding the text
EduBook Organización
3353 visitas
SHE LOOKS AT HIS BACK CAREFULLY Carefully is an adverb. It describes how Mary looks at Colin's back. We use adverbs to describe how we do something. We usually make adverbs by adding ly to the…
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Renewable energy sources
EduBook Organización
3549 visitas
Energy sources that will not run out are called renewable energy sources. Some examples are the Sun, water and wind. The energy that we obtain from renewable sources is called clean energy because it…
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Introduction - Heat, light and sound
EduBook Organización
3519 visitas
Heat, light and sound are all around us. We can feel heat from the Sun in the summer and from a radiator in the winter. We need light to see people and objects. We get light from the Sun during the day…
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Summaries - Animal nutrition
EduBook Organización
3436 visitas
1. Feeding and digestion in animals Animals are heterotrophic; they need to find food and transform it to get nutrients. These substances provide energy and materials the animal needs to grow, make new…
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Feeding and digestion in animals
EduBook Organización
3393 visitas
1.1. How do animals feed? Animals are heterotrophic; they need to find food and transform it to get nutrients. These substances provide energy and materials the animal needs to grow, make new tissues…
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Remember - Heat, light and sound
EduBook Organización
3358 visitas
Heat, light and sound are all around us. We can feel heat from the Sun in the summer and from a radiator in the winter. We need light to see people and objects. We get light from the Sun during the day…
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