La igualdad social

La igualdad de los bienes no es una quimera. (…) El derecho de propiedad está limitado, como todos los otros, por la obligación de respetar los derechos de los demás (…). La sociedad está…

Sabías que…

John M. Keynes (1883-1946) fue un economista británico que defendió la intervención del Estado para superar la crisis económica. Consideraba que la inversión pública, por ejemplo en…

Andy Warhol

Nacido en Pittsburg (Estados Unidos), Andrew Warhol (1928-1987) fue la figura más influyente del Pop art. Entre 1945 y 1949, se graduó en dibujo y diseño, mientras los veranos trabajaba como…

Los medios de comunicación

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?

Check. Test yourself

Which energy is used in photosynthesis? And in respiration? Where do plants store energy? Name three important plant biomolecules. [...]

Remember - Interaction, adaptation and coordination in animals and plants

The functions of interaction coordinate an organism's vital functions. They help individuals interact with and adapt to their environment. Living things constantly receive a large amount of…

Volcanoes

2.1. Volcanoes Volcanoes are formed when magma rises to the surface of the Earth (figure 1). During an eruption, there are explosions when gases escape from the magma. The lava pours out and forms lava…

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.

Check. Light, shadow and penumbra

Remember what you have studied in this section and answer the questions: Name two effects that show that light travels in a straight line. Can you demonstrate it now? With a classmate, describe the…