Los efectos de las migraciones

3.1. Efectos en la economía y en la sociedad Las consecuencias económicas Las migraciones internacionales tienen importantes efectos económicos, porque una buena parte de los ahorros que los…

La resistencia en Vietnam

A su excelencia Lyndon B. Johnson: Vietnam se encuentra a miles de kilómetros de Estados Unidos. Los vietnamitas nunca han hecho ningún daño a EE.UU., pero EE.UU. (...) ha intensificado la agresión…

El léxico Español

Els adverbis

Els adverbis La gramàtica: morfologia verbal

Introducció - El significat dels mots

Introducció El significat dels mots

Think about it. Biotic factors

Remember what you have studied in this section and answer the questions: What is the name for a relationship in which both species benefit? one species benefits and the other is unharmed? Give two…

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…

Check. Motion

Remember what you have studied in this section and answer the questions: Why do we need an origin as a reference point to know the position of a moving object? With a classmate, say what trajectories…

True and False. Equilibrium

Answer true or false: An object is in equilibrium when the sum of the forces acting upon it is equal to zero. If an object is in equilibrium it cannot be moving. A block at rest hanging on the cable of…

Analyse. Learn to build and calibrate a thermometer

To build a simple alcohol thermometer you can use a conical flask containing alcohol (mercury is toxic), and a capillary tube. Equipment A container to boil water, two beakers, ice cubes, a capillary…