Las lenguas del mundo

Calculate. The transpiration of a tree

A tree has 150000 leaves, due to transpiration eeach leaf loses 1 mL of water an hour in one day during a hot summer. ¿How many litres of water are lost in one day with 13 hours of light?

Analyse. Learn how a mountain range is formed

As you already know, the Himalayas were formed when the Indian Plate collided with the Eurasian Plate. The oceanic lithosphere subducted under Eurasia and the oceanic sediments, which were very light,…

Final Autoevaluation 9.08 - Motion and forces

Answer true or false: Friction is a type of force. Friction is the force between an object and the surface on which the object moves. The effect of friction is equal to the movement. The friction value…

Check. Test yourself

Remember what you have studied in this unit and answer the questions: List different forms of energy and give two examples of when each one operates. What type of energy is possessed by a girl who is…

Summaries - Heat and temperature

1. Energy transfer: heat Heat or thermal energy is the energy that is transferred from hot bodies to cold bodies. All the particles that make up bodies have internal energy; the particles in a hot body…

Match. Origins of heat

Choose the correct answer: What other words do we use to describe heat? What is a heat source? How is the Sun a heat source? Why when we rub two sticks of wood together do we generate fire?

True/False. Groups of waves on the electromagnetic spectrum

Answer true or false: All electromagnetic waves can be seen. Ultraviolet rays have more energy than visible light. Ultraviolet rays have more energy than gamma rays. The different colours of visible…

Enlightenment principles

Natural or moral equality is based on the constitution of human nature common to all men, who are born, grow, live and die in the same way. The first state that man acquires in nature, and that is…

Before you start - Liberal revolutions and nationalist movements (1789-1...

Didactic objectives Identify the ideological and political content of liberalism and nationalism. Know and describe the main events of the French Revolution and the causes that triggered them. Describe…