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Check. Population and agriculture in the 19th century
EduBook Organización
- 3089 visitas
Remember what you have studied in this section and answer the questions: What migrations, internal and external, occurred during the 19th century? What population changes took place? What areas…
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Why do boats float?
EduBook Organización
- 3085 visitas
If we make a little boat out of a walnut shell, we see that it floats and we relate this to the fact that the walnut shell is less dense than water. But what about real boats? Some of them are huge,…
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Let's learn how to... - Work
EduBook Organización
- 3064 visitas
Do a survey A survey is a way of collecting information, or data. To do a survey, we use a questionnaire. This is a list of questions that ask for specific information. When you do a survey you should…
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End-of-unit evaluation - Machines and structures
EduBook Organización
- 3055 visitas
In this unit we will look at electrical circuits, generators and motors that work by magnetism. We will also look at the machines and tools which help us do our work. Finally, we will look at…
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Exploitation of the indigenous population
EduBook Organización
- 3066 visitas
You focus all your attention on creating new kinds of taxation, and you make no effort at all to increase the people's wages so that they can pay the taxes (...). The consequence is greater poverty…
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Let's learn how to... - The weather
EduBook Organización
- 3029 visitas
Study the weather in our area What do we need? A notebook. A thermometer. A ruler. What do we do? Copy the table below into your notebook. Make it longer so that it has 15 days. Observe the weather…
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End-of-unit evaluation - Science and technology
EduBook Organización
- 3027 visitas
Progress in science and technology has improved our quality of life. New technologies have also led to the creation of computers and the Internet. Computers have become an essential part of most…
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CERN. Interviews / Tim Berners-Lee
Xtec Organización
- 3023 visitas
Ten Years Public Domain for the original Web Software : message from Tim Berners-Lee. 'CERN's decision to make the Web foundations and protocols available on a royalty free basis, and without…
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Introduction - The weather
EduBook Organización
- 2984 visitas
The layer of air that surrounds the Earth is called the atmosphere. All the weather on the Earth happens in the atmosphere. Changes in the atmosphere cause different types of weather. People who study…