How does the angle of the Sun's rays affect the temperature of the Earth's surface? 1. First, put one of the lamps directly above a piece of chocolate. Put the other light bulb to one side of the other piece of chocolate. 2. Then, turn on the lamps. Leave them for 8–10 minutes. 3. Finally, check how hard the chocolate is. Represent the movements of the Earth 1. Draw and label each of the constellations of the Zodiac on separate pieces of paper. 2. Make a circle with 12 students holding the drawings in the correct order. 3. Place a strong light source in the centre of the circle to represent the Sun. 4. The rest of the class takes turns walking round in a circle between the light source and the constellations, representing the Earth's revolution and rotation. Conclusions 7 The drawing shows the classical constellations of the Zodiac, but one more constellation has been recognised by some astronomers. What is this constellation called? Why have they added it? 8 Can the student see the same constellations while they are moving? Why or why not? 5 Which of the pieces of chocolate is softer? Why? 6 Use your results to explain why in Spain it is hotter in summer than in winter. Conclusions Materials Two desk lamps with light bulbs that emit heat Two pieces of chocolate of the same size Materials 12 pieces of paper Steps Steps Leo 21 1
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