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Across 1. A large destructive mass of mud sliding down a mountain. 4. A hole formed when weak soil makes the ground above fall into a great pit. 5. A big windstorm that makes clouds of sand that move along the ground. 8. The slide of large masses of snow and ice down a mountain. 10. The sudden, violent dexplosion of steam and material from a volcanic mountain. 11. A violent storm of thunder and lightning and rain. 12. A severe tropical storm with heavy rains and circular, spinning winds.

Down 2. The downward sliding of a lot of dry earth and rock. 3. A giant wave caused by the tides. 6. A large, sudden movement of land. 7. The destructive, funnel-shaped windstorm forming on land. 9. A very huge ocean wave caused by an underwater earthquake.