Learn to calculate your lung capacity

When we take a deep breath in and then breathe out as much air as possible, the volume of air exhaled is called the vital capacity of the lungs. After forced exhalation, the lungs still contain around…

Match. Eclipses

Match the sentences: In a solar eclipse, the areas of the Earth where the eclipse shadow is cast is complete, … When the Earth moves between the Sun and the Moon… A total eclipse of the Sun… The…

Light and colours

5.1. The composition of white light White light is actually made up of many colours. We can see this if we pass white light through an optical prism (figure 1). 5.2. The colours of objects When white…

True/false. The impact of European civilisation

Are the following sentences true or false?: The colonised territories suffered a profound impact with the arrival of Europeans. The United States created new countries and invented new national borders.…

The Cold War and peace (1845-1975)

The rivalry between the United States and the Soviet Union was referred to as the Cold War. While the tension between the two superpowers never led to war, both sides engaged in an arms race and…

Check. The transition to democracy

Remember what you have studied in this section and answer the questions: Describe the role played by the political parties and these people in dismantling Francoism: Juan Carlos I, Carlos Arias Navarro…

Ejercicios: la línea divisoria

Ejercicios: la línea divisoria La música y medios de comunicación: música clásica

El paisaje

Fíjate. Figuras semejantes

No es suficiente que los lados de dos polígonos sean proporcionales para que estos sean semejantes. Un cuadrado y un rombo tienen siempre los lados proporcionales y en cambio no son semejantes. Tampoco…

Figuras semejantes. Actividad 3

Razona por qué dos polígonos regulares de igual número de lados son semejantes. Dos polígonos regulares de igual número de lados son semejantes si los correspondientes son y los correspondientes son .