Geography

2. The process where rocks are broken down by natural forces such as wind or water
4. Rocks that are swept into and abrade small holes
5. A circular or cylindrical hole in the riverbed which is produced by the force of water and abrasion
7. Found at the bottom of a waterfall and are formed by erosion.
11. A steep usually small fall of water
13. Flow of water descending steeply over a cliff. Also called a cascade
14. Stream that feeds, or flows, into a larger stream
16. Solid rock underlying loose deposits such as soil or clay.
18. To fall sharply
19. A narrow valley with steep, rocky walls located between hills or mountains.
21. The matter that settles to the bottom of a liquid

1. Liquid flowing quickly in a circular motion, pulling material downward into its center
3. Waterfall edge
6. The laying down of sediment carried by wind, flowing water, the sea or ice
8. A rock formation that develops when a body of water erodes the base of a rock.
9. Layer of rock visible above the surface of the Earth
10. Very small, rounded rock
12. The process of scraping or wearing something away
15. To go backward or withdraw
17. A part of something that sticks out or hangs over another thing (waterfall)
20. The process of waterfall moving inland