Investiga. Francisco de Goya (1746-1828)

Nacido en Fuendetodos (Zaragoza), Goya fue un artista único, cuya obra es difícil de clasificar estilísticamente, debido a su constante innovación. Sus inicios, marcados por un viaje a Italia,…

Introducción - Un mundo bipolar: Guerra Fría y descolonización (1945-1991)

Desde 1945 hasta 1991, el mundo estuvo dividido en dos bloques antagónicos: el socialista, dirigido por la URSS, y el capitalista, liderado por Estados Unidos. Europa occidental, Japón y amplias zonas…

El léxico español

Learn. Spontaneous generation

How did Pasteur prove that the theory of spontaneous generation of living things was false? Why do we need to use heat to sterilise surgical instruments? Explain your answer.

Temperature and insect growth

The body temperature of an insect varies according to the temperature of its surroundings. This is why insects grow more quickly in summer and more slowly in autumn and winter. Each species has its own…

Matter is recycled and energy is lost in ecosystems

When living things die, decomposers use the organic material to obtain energy. In doing this, they turn the organic biomolecules into inorganic material again. The action of decomposers closes the cycle…

Learn. Risks from volcanoes - Energy inside the Earth

Volcanic eruptions can cause loss of human life and material damage. This can be because of the material ejected from the volcano or as a consequence of the seismic activity which usually accompanies…

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…

Answer. Forces

Look at the different formulas and answer the questions: Which forces have the same meaning as F1? Which forces have the same magnitude as F1? Which forces have the same direction as F1?

Define. Concepts

Define these words: Oscillatory motion Transverse wave Penumbra Refraction of light Primary colours of light Source of sound Echo