Across
- 4. a translucent variety of quartz
- 6. geological process that operates the same today as the past
- 8. the process of breaking down something by physical force
- 9. the process of wearing down and carrying away rock
- 12. breaks down rock through chemical damage
Down
- 1. the process that breaks down rock and other substances
- 2. a whitish mineral consisting of magnesium carbonate, used as a heat-resistant lining in some furnaces.
- 3. wears away at rock by rock being carried by water, ice, wind, or gravity
- 5. process that splits rock when water seeps into cracks, freezes and expands
- 7. any of a group of calcium phosphate minerals occurring variously as hexagonal crystals, as granular masses, or in fine-grained masses as the chief constituent of bones and teeth and of phosphate rock.
- 10. a chemical in which a substance combines with oxygen, as when iron oxidizes, forming rust
- 11. means full of tiny air connected air spaces that allow water to seep through it