La Unión Soviética y el bloque socialista

5.1. La reconstrucción económica La Unión Soviética salió de la Segunda Guerra Mundial destrozada en el aspecto material, pero enormemente reforzada en su papel de líder de los comunistas del…

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In our country, there is a great variety of ecosystems: mountainous areas with coniferous forests, deciduous forests, riverside woods, rocky or sandy coasts, lakes and even deserts. This diversity is…

Complete. The tectonic plates

Write the name of the tectonic plates: pacific - Nazca - south american - eurasian - antarctic Plate Plate Plate Plate Plate

Check. Risks from volcanoes

Remember what you have studied in this section and answer the questions: Can a volcano be dangerous if it is only emitting gas? Why? How can we avoid damage and the loss of human life during a volcanic…

Unit 2: Animal nutrition

Absorption (n): taking in a substance or energy from the surrounding area. aerobic respiration (n): respiration which takes place in the presence of oxygen. anaerobic respiration (n): respiration which…

Did you know?

The density, d, of an object shows the relationship between the mass, m, of the object and its volume, V: d = m / V The SI unit of density is kg/m3, but g/cm3 and g/dm3 are also used.

Why do boats float?

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,…

Check. Simple machines

Remember what you have studied in this section and answer the questions: Give the names of some simple machines and say how they work. The lever is one of the most commonly used simple machines. Mention…

True/False Light and Sound

Answer true or false: Sunlight comes instantly to Earth. All objects emit their own light. The speed of light is faster than the speed of sound. Sound can be spread by a vacuum.