Edges and Boundaries

Across

1. Volcanic glass used for cutting tools

2. Stone used to start a fire

3. Coastline edge or thread end

4. Argue over small or petty matters

11. Enclosure for confining prisoners or animals

12. Edge between two countries or areas

13. Small cave often found near water

Down

5. Deep fissure in the earths surface

6. Supporter of the Stuart claim to the throne

7. Broad street lined with trees or shops

8. Shallow crossing point for a river

9. Edge of land by the sea

10. Equally distant from two points