Solve the crossword

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Across
  1. 1. Three dimensional representation of the Earth
  2. 3. The continent that is believed to be the origin of mankind
  3. 4. The most remarkable invention of Neolithic man
  4. 6. The study of coins.
  5. 9. the coldest zone of the Earth
  6. 10. Greatest achievement of man during Palaeolithic age
Down
  1. 1. A network of lines of latitude and longitude intersecting each other.
  2. 2. The author of Abhigyan Shakuntalam
  3. 5. Representation of the Earth on a flat surface
  4. 7. Expert of map making
  5. 8. The line of longitude passing through the British Royal Observatory