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💡 10 / 10
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Across
- 4. Ptolemy wrote a treatise of this name; its tools are the map and the contour (9)
- 6. Rutherford split it; Democritus named it 'uncuttable' (4)
- 9. Where Polaris hangs, and where all lines of longitude meet (5)
- 10. Less dense than its liquid form, which is why bergs float (3)
- 11. Blake asked it about its fearful symmetry (5)
Down
- 1. Humpty Dumpty was one; Faberge made jewelled ones (3)
- 2. Wegener argued they had drifted apart (9)
- 3. Mercator's projection distorts one (3)
- 5. Caesar's calendar reform fixed its length; every fourth one gains a day (4)
- 7. In Spain it falls mainly on the plain, per Professor Higgins (4)
- 8. An age of prehistory, and fourteen pounds (5)