Learn where earthquakes happen and how they are rated

Learn more about seismic tremors from National Geographic.

Infecciones respiratorias

En esta página disponemos de un texto que resume las principales infecciones respiratorias.

Pulley Examples

The pulley is a simple machine made with a wheel and a rope, cord, or chain. Pully examples show the purpose and uses of pulleys.

HOMEWORK...docx

Versiones de las Meninas de Velázquez.

Breve presentación en Bits de algunas de las versiones de las Meninas del pintor Diego de Velázquez por él mismo y otros autores.

Dicionario de pronuncia da lingua galega

Dicionario online de pronuncia que nos permite escoitar todas as palabras en galego para diferenciar a súa fonética.

World powers claim over Arctic's resources

Russia has promised to defend its national interests and security in the Arctic. The energy rich region is contested by many countries including Canada which...

EU over-achieved first Kyoto emissions target, on track to meet 2020 objective

The European Union has succeeded in cutting its greenhouse gas emissions 18% since 1990, new reports from the European Commission and European Environment Agency show. The EU has also over-achieved its…

Articles: a / an . Grammar exercises - indefinite articles

Articles: A / AN

Fracción generatriz

Descripción de la fracción generatriz. Se explica la obtención de la fracción generatriz y se proponen ejercicios.