Across
- 3. fine-grained, composed mainly of clay minerals
- 4. limestone composed of calcium carbonate
- 5. quartz-rich sandstone altered by the heat
Down
- 1. composed in the form of the mineral calcite
- 2. composed mainly of plagioclase and pyroxene
- 3. breaks into thin pieces with sharp edges formed by mineral particles call mud
- 6. form from explosive volcanic eruption