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Changes of state
EduBook Organización
- 1616 visitas
2.1. Changes of state of water Water is the best known example of a substance that occurs in the three states. Changes of state are caused by the action of heating or cooling (or changes in pressure).…
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Atmospheric phenomena
EduBook Organización
- 1620 visitas
6.1. Wind Wind is the movement of air produced by the differences in air pressure between two different places. These differences occur because the heating of the Earth's surface is uneven. Winds…
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Find out more. The Sahara conflict
EduBook Organización
- 1564 visitas
Spain's colony in the Sahara was very attractive to its neighbours, especially Morocco, owing to the region's wealth in terms of phosphates and fishing. In 1973 the Polisario Front was created,…
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True/false. The atmosphere
EduBook Organización
- 1542 visitas
Are the following sentences true or false? The Earth has always had the same atmosphere. The most abundant components of the atmosphere are carbon dioxide and water vapour. Everywhere in the…
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The temperature of the earth
EduBook Organización
- 1420 visitas
Inside the Earth, temperature rises when you get nearer to the centre. This increase in temperature is known as the geothermal gradient. It is calculated that in the outer layers, it is 1 °C for every…
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Final self-evaluation 10 - The Atmosphere
EduBook Organización
- 1231 visitas
Complete the following sentences with the missing words: Carbon dioxide provokes an increase in the greenhouse effect. Acid harms lakes, rivers, forests and buildings. Atmospheric pressure is measured…
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Volcanoes - Volcanoes
EduBook Organización
- 952 visitas
A volcano is an opening (a vent) in a planet’s surface, which allows hot magma (liquid rock), ash and gases to escape. This event is called a volcanic eruption. During an eruption, pressure in the…
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