Solve these clues to fill the grid.
- The withdrawal of heat to change something from a liquid to a solid
- 4 Across
- The phenomenon of ___ or gravel accumulating
- 6 Across
- Condition in which the earth's surface is worn away by the action of water and wind
- 7 Across
- Substance used in or made by chemistry
- 8 Across
- Pertaining to ___ or to life and living things
- 9 Across
- Hard piece of stone (plural)
- 1 Down
- The breakdown or alteration of rock at or near the surface of the Earth.
- 2 Down
- A natural protective body covering and site of the sense of touch
- 3 Down
- Bulbous plant having hollow leaves cultivated worldwide for its rounded edible bulb
- 5 Down