Sabías que…

En los inicios de la industria, el trabajo infantil era frecuente. Los niños y niñas de las familias obreras no iban a la escuela o la abandonaban a edad muy temprana (7 u 8 años) para trabajar en…

L'accent, la dièresi, l'apòstrof i el guionet

L'accent, la dièresi, l'apòstrof i el guionet Els sons de la llengua. L'escriptura dels sons

La gramàtica: morfologia nominal

Els adverbis

Els adverbis La gramàtica: morfologia verbal

Internal geodynamics and surface relief

The forces inside the Earth cause mountain chains to form They also deform rocks and form folds, or break rocks and cause geological faults or joints. 6.1. Mountain ranges Mountain ranges are chains of…

Invetigate. Learn to observe different kinds of change in matter

In this experiment you will observe physical and chemical changes in matter. Follow the instructions carefully. Copy and complete the table below. Place a half spatula of calcium carbonate into a test…

Calculate. Displacement and distance travelled

Look at the diagram and calculate the displacement and total distance travelled in each case d: Displacement d = m. Distance travelled = m. Displacement d = m. Distance travelled = m. Why is…

Energy transfer: heat

1.1. Heat The particles that make up matter store energy: Heat or thermal energy is the energy that is transferred from hot bodies to cold bodies (figure 1). All the particles that make up bodies have…

The reflection of sound

7.1. Reflection of sound Sound is transmitted in a straight line. When it meets obstacles that it cannot cross, like a wall or a rock, it is reflected back in the other direction. Two phenomena caused…

Learn. Noise pollution - Waves. Light and sound

Noise pollution Noise pollution is when there are sounds that are too intense and prolonged in a certain place. For example, sounds with an intensity higher than 55 decibels make it difficult for people…