NATURE 5

3. A flat-topped elevated landform with steep sides, often formed by erosion or tectonic activity.
6. A narrow and deep valley with steep, rocky sides, often carved by a river or glacier.
8. A landscape characterized by sinkholes, caves, and underground drainage systems formed by the dissolution of soluble rocks such as limestone.
9. A hot spring that intermittently ejects a column of water and steam into the air, often with great force.
12. A shallow body of water separated from a larger body of water by barrier islands, reefs, or sandbars.
14. A steep slope or cliff formed by erosion or faulting, separating two relatively level areas of differing elevations.
15. A tall, thin spire of rock that protrudes from the bottom of an arid basin or badland, often with a capstone.
17. A large underground chamber or cavity, often formed by the dissolution of limestone or other soluble rocks.
18. A type of volcanic rock formed from consolidated volcanic ash, often found near volcanic vents or craters.

1. A large mass of ice that moves slowly over land, carving valleys and shaping the landscape.
2. A natural underground chamber or passage, often formed by the dissolution of limestone.
4. A bowl-shaped depression or cavity, often at the summit of a volcano or formed by a meteorite impact.
5. A mass of rocks, gravel, and sediment carried and deposited by a glacier, forming a ridge or mound.
7. A flat-topped hill with steep sides, smaller than a mesa and often isolated in a plain or desert region.
10. A depression or hole in the ground caused by the collapse of a surface layer, often formed in limestone regions.
11. A fracture or zone of weakness in the Earth's crust along which movement or displacement occurs.
13. A large landform that rises prominently above its surroundings, often with a peak or summit.
16. A mound or ridge of sand formed by the wind, typically found in deserts or coastal regions.