All the answers begin Pet...
1. A case containing an explosive.
2. A Naval rank corresponding to an N.C.O. in the Army.
 Petty Officer.
3. The study of rocks.
4. A seabird related to the albatross.
5. French game, using steel bowls.
6. To turn to stone.
7. Name given to an in incident in Manchester in 1819 leaving eleven people dead.
 Peterloo Massacre.
8. Small, very fancy biscuits.
 Petit fours.
9. Genus of plants related to tobacco.
10. A rough napped cloth and the greatcoat from which it was made.