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The temperature of the earth
EduBook Organización
- 1417 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 05 - The Earth's surface: shaping human activity
EduBook Organización
- 1430 visitas
Choose the correct answer: This very irregular stretch of Spain's coastline is made of old rock that has been highly eroded over time: This element of Spain's relief is surrounded by the Montes…
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Danger in the Lagoon
EduBook Organización
- 1468 visitas
Peter, Wendy, John, Michael and the Lost Boys often go to the Mermaids’ Lagoon. The water is blue and beautiful. They like swimming and playing in the blue lagoon. Beautiful mermaids live here, and…
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What is sedimentation?
EduBook Organización
- 1384 visitas
Sedimentation is the process of depositing materials. It can happen in different ways: Dissolved material in a river may be deposited if the water evaporates. A rock mineral called calcite is formed in…
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Self-assessment T01 01 - Our planet Earth
EduBook Organización
- 1344 visitas
Are these sentences true or false? The crust is between 100 km and 500 km thick. The mantle is at the centre of the Earth. The liquid rock near the centre of the Earth is called magma. The rocks in the…
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Final self-evaluation 10 - The Universe and our Solar System
EduBook Organización
- 1332 visitas
Are the following sentences true or false? A medium-sized star ends its life cycle as a black dwarf. Large, dense stars end their life cycles as white dwarfs. Large, dense stars explode and become…
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Modal Verbs "must" and "can't"
EduBook Organización
- 1316 visitas
‘I saw layers of rock with moss fossils. “We can’t be in the Cambrian Period because there wasn’t any moss then,” I thought. “So we must be in the Silurian.”’ We use the modal verbs must…
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Self-assessment T01 10 - Our planet Earth
EduBook Organización
- 1167 visitas
Match the definitions to the terms: They cause earthquakes, volcanic eruptions and the formation of mountain ranges. A large sphere of rock with a diameter of 13000 km. This is the process of depositing…
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Must - Understanding the text
EduBook Organización
- 1201 visitas
'YOU MUST GIVE IT TO ME!' We use must when something is important or necessary. Example: Mowgli must learn the Law of the Jungle. We sometimes use you + must to tell someone to do something. You…