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The Earth, a Living Planet
EduBook Organización
- 8922 visitas
The existence of water and a protective atmosphere were key elements for the appearance of life on Earth. The first cells appeared 3.5 billion years ago. From these early forms of life, different groups…
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Matter and materials
EduBook Organización
- 8904 visitas
Everything around us is made of matter. Matter can be solid, like a table, liquid, like milk, or gas, like the air. All matter is made of different materials. Some things are made of wood, like a…
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Obtaining and using energy
EduBook Organización
- 8799 visitas
Energy drives the Universe and is part of all the changes which take place on Earth. The Sun is our main source of energy. Without it, there would be no life and most other sources of energy would not…
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Summaries - The legacy of classical culture
EduBook Organización
- 8237 visitas
1. The Greek and Roman Gods The classical religions were polytheístic and anthropomorphic. Each god was represented by a symbol of his or her power or supernatural ability. The gods were immortals…
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Before you start - Animal nutrition
EduBook Organización
- 8001 visitas
Animals are heterotrophic organisms; they cannot make the organic material they need to eat. They can get organic material from other animals and from plants. Plants are the only living things that can…
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Society and economy in the Roman Empire
EduBook Organización
- 7735 visitas
4.1. Urban society During the expansion of the Roman Empire, hundreds of cities were built. They all had a similar structure, with a central square (forum) and walls around the city. There were many…
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Investigate - Plant nutrition
EduBook Organización
- 7470 visitas
All living things need to carry out their vital functions. To do this, they need food and energy. Unlike animals, plants make their own food. They need very simple substances like water and mineral…
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Internal forces in the formation of relief
EduBook Organización
- 7440 visitas
2.1. Internal forces Below the surface of the Earth, gases and compressed materials put pressure on the crust. They can deform it or make it crack. These internal forces are what cause earthquakes and…
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