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Planet Earth
1. THE EARTH AND THE UNIVERSE. 1. 1. The universe. The universe appeared 13. 700 million years ago with the “Big Bang”, the explosión of a small mass which contained all the existing matter and energy. The universe is made of: Stars a celestial body which produces its own light and heat. other celestial… Leer más
1. Basic components of the physical enviroment. Landforms. 1. 1. Landforms of Surface relief. We can distinguish four basic relief forms on the continents and islands. a).Plains, extensive áreas of flat or gently undulating land which are located at an altitude of less than 200 metres above sea level. b).Plateaus, elevated plains which are… Leer más
1. 1. Functions and composition of the atmposphere. Definition: atmosphere is the gaseous layer that surrounds the Earth. Composition. It is made up of water vapour and mixture of gases:nitrogen, 78%oxygen, 21%ozone.carbon dioxide. Functions. Its makes life on Earth possible because: it provides gases that are essentials to life… Leer más