Across
- 4. what term describes a huge hole left in the ground when an ice chunk left by a retreating glacier melts?
- 5. what is a huge, bowl-shaped depression dug out by a valley glacier?
- 8. what is the drainage divide in the Rocky Mountains west of the Mississippi River drainage basin?
- 13. what is the name of the triangular sediment deposit formed on a plain by a temporary mountain stream?
- 17. what is the stripping away of a thin area of topsoil from the surface of the land?
Down
- 1. what is the main agent of chemical weathering?
- 2. what type of weathering occurs when rainwater soaks into cracks in a rock and freezes, splitting the rock?
- 3. what type of dune is arch shaped, with the open end of the arch pointing to the windward side?
- 6. what is the fan-shaped deposit left by a large river when it reaches the ocean?
- 7. what is a sudden slide of huge masses of rock or soil down a slope?
- 9. what type of landslide involves fine soil and small pebbles falling in large masses down a slope?
- 10. what are the winding, looping curves of rivers?
- 11. what are limestone formations that have become filled with various passageways and large caves?
- 12. which natural acid, found in rainwater and groundwater, promotes chemical weathering of rocks?
- 14. what is the name for the time when one-third of the earth's land area was covered in glaciers?
- 15. which type of weathering does not change the chemical composition of the minerals that compose a rock?
- 16. what is the name for a vertical face of rock that forms when the sea removes rock from the base of a high ridge?