1. geometría   physics   chemistry   geology   geometry   Hint Half-n-half Clue   2. filosofía   algebra   geometry   geology   philosophy   Half-n-half Clue   3. cálculo   geography   biology   calculus   chemistry   Half-n-half Clue   4. astronomía   astronomy   chemistry   biology   botany   Half-n-half Clue   5. geología   calculus   chemistry   botany   geology   Half-n-half Clue   6. química   geology   chemistry   physics   geometry   Half-n-half Clue   7. historia   history   physics   zoology   geography   Half-n-half Clue