Solve these clues to fill the grid.
- The property of sound that varies with variation in the frequency of vibration
- 1 Across
- A number of sheets of paper fastened together along one edge (plural)
- 4 Across
- A closed plane curve resulting from the intersection of a circular cone and a plane cutting
- 6 Across
- A game played with a ball and bat by two teams of 11 players
- 8 Across
- Round object used in games
- 9 Across
- Green plant covering lawns
- 10 Across
- Armor plate that protects the head
- 2 Down
- A club used for hitting a ball in various games
- 3 Down
- The occupation of athletes who compete for pay
- 5 Down
- An ability that has been acquired by training (plural)
- 7 Down
- The color of a fire truck
- 11 Down