Across
- 2. A hard white or colorless mineral consisting of silicon dioxide, found widely in igneous, metamorphic, and sedmentary rocks.
- 4. A dark natural glass formed by the cooling of molten lava.
- 5. An extrusive igneous rock, which forms from volcanic lava that cools rapidly at Earth's surface.
- 8. A coarse-grained (phaneritic) intrusive igneous rock composed mostly of quart
- 9. A fissile rock that is formed by the consolidation of clay, mud, or silt, has a finely stratified or laminated structure, and is composed of minerals essentially unaltered since deposition
- 11. a type of sedimentary rock that is composed of large, rounded rock fragments contained within a smaller, fine-grained matrix of sediments.
- 12. A rock that is formed chiefly from animal remains (as shells or coral), consists mainly of calcium carbonate, is used in buil ding, and gives lime when burned.
Down
- 1. A clastic sedimentary rock composed mainly of sand-sized (0.0625 to 2 mm) silicate grains, cemented together by another mineral.
- 3. A type of rock composed of more than 66% silt-sized grains, typically consisting of angular quartz grains along with feldspar, mica flakes, and up t 33% clay.
- 6. A rock composed of sharp fragments embedded in a fine-grained matrix (such as sand or clay).
- 7. An extrusive igneous rock, meaning it is formed from lava that has erupted from a volcano and coole d quickly on the
- 10. typically dark colored, large-crystal igneous rock that forms from the slow cooling and crystallization of magmas below the Earth's surface.