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UNIT 18. SPAIN'S NATURAL ENVIRONMENT

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UNIT 17. THE PROPERTIES OF MATTER

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UNIT 16: HEAD AND TEMPERATURE

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UNIT 15.SOUND AND LIGHT

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UNIT 14.STATES OF THE MATTER

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UNIT 13. MODERN AGE

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UNIT 12. MIDDLE AGES

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UNIT 11. FIRST CIVILISATIONS

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UNIT 10. ANCIENT ROME

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UNIT 9. STONE AGE

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UNIT 8. THE LIQUID PART OF THE EARTH

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UNIT 7. THE SOLID PART OF THE EARTH

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  1. UNIT 6.VOLCANOES
  2. UNIT 5. THE GASEOUS PART OF THE EARTH
  3. UNIT 4. CLIMATES OF THE WORLD
  4. UNIT 3. WEATHER AND CLIMATE
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