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Pure substances and mixtures
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4.1. Pure substances and mixtures Pure substances are substances made up of a single type of element or compound. Two examples of pure substances are iron and salt. A mixture is made up of different…
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Summaries - Society and the environment
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1. The Earth is an ecosystem The Earth is a complex ecosystem because it is made up of closely interrelated elements. These elements are: Lithosphere, or the Earth’s surface. Hydrosphere, or all of…
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Spain's labour force
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Labour force A country's labour force (or active population) includes all the people who are working or looking for work (unemployed). In 2007, Spain's labour force was 58.9% of the population…
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Complete. Classification of energy sources 01
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Complete the following sentences with the missing words: Energy sources are natural from which we can obtain . According to whether they can run out or not, energy sources can be classified as or . The…
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Waves
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1.1. Vibratory motion If we hold one end of a sheet of steel and then move or hit the free end, the sheet will vibrate from one side to the other from its initial position (figure 1). We can compare…
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Adrenaline prepares for action
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In situations of danger or fear, the adrenal glands produce a hormone called adrenaline. This prepares the body for action, like running or hiding. This is called the fight or flight response.…
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Unit 4: Animal reproduction
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Break off (v): to become separated from the main part of something. bud (n): a group of cells which differentiates and breaks off an animal to create a new individual by asexual reproduction. budding…
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David's house
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Houses did not have electricity Clara's great-grandfather lived in a village when he was young. Great-grandfather David's house did not have electricity. People used oil lamps or candles to…
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Peaceful coexistence
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You can like your neighbour or not. You are not obliged to become friends or pay him visits. But what do you do if neither of you want to move? There are only two options: war, which with today's…
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Communication by Internet
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E-mail E-mail (or electronic mail) is a system of sending messages from one computer to another. It is the most popular service on the Internet. The person who sends the message (or e-mail) is called…
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