Moderate difficulty suitable for most players
Enigmatic Wonders of Earth's Geology
Moderate difficulty suitable for most players
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Across
- 1. Volcanic rock rich in alkali feldspar
- 2. Viscous natural asphalt often found in seep deposits
- 5. Nickname for reddish-brown sandstone often found in deserts
- 7. Dark volcanic rock forming ocean floors and large plateaus
- 10. Geological process where Earth's crust is raised
- 12. Step-like landform formed by river erosion or deposition
- 13. Large volcanic crater formed by collapse
- 15. The upper layer of Earth's crust, rich in silica and aluminum
Down
- 3. Crater formed by volcanic explosion with water interaction
- 4. Tall, thin spire of rock formed by erosion
- 6. Landform surrounded by water on most sides but connected to mainland
- 8. Large boulder transported and deposited by glaciers
- 9. Ring-shaped coral reef enclosing a lagoon
- 11. Porous structure in rocks aiding gas exchange
- 14. Mass of ice slowly moving over land
- 16. Depression or sinkhole in karst landscapes
- 17. Opening through which volcanic material escapes