Across
- 5. The sudden and violent discharge of gas, ash, molten rock, and other materials.
- 9. Quantifies the magnitude of an earthquake based on the amplitude of seismic waves recorded by seismographs.
- 13. A crack or fracture in the Earth's crust along which movement has occurred.
- 14. A sudden and violent shaking
- 16. A severe lack of rainfall in an area over a certain time period.
- 17. Secondary waves - travel slower and only move through solids.
- 18. A spinning column of air with wind speeds up to 300 miles per hour.
Down
- 1. The downward movement of rock or debris from a mountain or hill.
- 2. Primary waves - travel faster and can move through liquids and solids
- 3. Days of heavy rainfall that causes rivers, streams, lakes, and other bodies of water to rise over their banks.
- 4. Vibrations generated by earthquakes or artificial explosions that travel through Earth's interior.
- 6. Catastrophic events caused by nature that change the Earth's surface.
- 7. A long, high wave of water caused by an earthquake or volcanic eruption.
- 8. An intense storm that forms in the ocean with swirling winds up to 150 miles per hour.
- 10. A large fire that spreads quickly and destroys forests, grasslands, and other areas.
- 11. Measures the intensity of an earthquake based on its observed effects on people, buildings, and the Earth's surface.
- 12. Warnings can be sent out quickly to inform people to take shelter immediately.
- 15. A type of plate boundary where two tectonic plates slide past each other horizontally.