The natural environment

1.1. The energy of the sun and life The ecosphere is a hypothetical zone existing around any star where the temperature allows life to exist. The conditions which make it possible for life to exist on…

The periodic table and chemical formulas

5.1. The symbols of chemical elements Each one of the 118 known chemical elements has a name and is represented by a chemical symbol. These symbols consist of one or two letters (the first a capital…

Observe. The periodic table and chemical formulas

Look at the photos and answer the questions: Look at figures 1-3. Say which elements are present in each compound and how many atoms there are of each. Which of these compounds is used as fuel?

Final Autoevaluation T12 03 - Waves. Light and sound

Answer these questions: What is sound? What are the characteristics of sound? At what speed does sound travel through the air?

Complete. The economy expansion

Complete the sentences about economic expansion with the missing words: In the late 19th century, the low price of produced in the Americas caused an agricultural in Europe. The crisis was particularly…

Complete. The International Brigades

Complete the text with the missing words: Ebro – Albacete – French – Republic – International – Brunete – Italian – Spain – military – brigades – foreign The Brigades were units made…

Complete. People's republics of Eastern Europe

Complete the sentences with the missing words: After 1945, European countries (the German Democratic Republic, Poland, Romania, Hungary, Bulgaria, Czechoslovakia, Yugoslavia and Albania) formed…

Audición musical. Edvard Grieg: Concierto para piano y orquesta. [...]

Audición musical. Edvard Grieg: Concierto para piano y orquesta. Tercer movimiento La música en el cambio de siglo

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