Las demandas de los obreros asturianos

1. Aumento de los salarios (…). 2. Jornada de siete horas y de seis para los trabajos nocturnos (…). 3. Igualdad de salarios para trabajo igual. 4. Dos meses al año de vacaciones pagadas.…

El ensayo, la exposición y la argumentación

Evalúa lo que sabes

Evalúa lo que sabes El signo

Final Autoevaluation 1.02 - Plant nutrition

J. van Helmont's experiment Van Helmont (1577-1644), a Flemish doctor and chemist, thought that in addition to water, air and substances in soil, other elements must be necessary for plant…

Think about it. The responses of plants

Remember what you have studied in this section and answer the questions: Discuss whether a plant would respond to light if the tips of the stem were cut off. Explain why poinsettias are typical…

Work it out. The natural environment

Remember what you have studied in this section and answer the questions: What environmental conditions prevent the existence of life on the other planets in the Solar System? Why is light a limiting…

Complete. Concept map

Complete the concept map:

Motion

A moving object is any object which changes position over time. 1.1. The trajectory of motion A trajectory is a line which connects the different positions occupied by a moving object (figure 1). A…

Ways to save energy

Look at the pictures and answer the questions. Which of these measures do you apply? Which do you think are the most useful?

True/False. Heat

Answer true or false Heat is the energy transferred from hot bodies to cold bodies. Heat also is sometimes called thermal energy. Cold bodies give cold to hold bodies. Hot bodies have less internal…