1. Hole at the top of a sea-cave which allows waves to force water or spray out of the hole
2. Depressions in a sand dune ecosystem caused by the removal of sediments by wind
3. Tall, near vertical rock face
4. A large dome-shaped, steep-sided, bald rock
5. Network of river channels
6. Isolated hill with steep, often vertical sides and a small, relatively flat top
7. Narrow inlet on the Mediterranean coast
8. Cauldron-like volcanic feature formed by the emptying of a magma chamber
9. Deep chasm between cliffs
10. Large headland extending into a body of water, usually the sea
