Rocks Crossword

2. made up of clay and consists of layers that typically break into thin sheets
4. intrusive equivalent of rhyolite but has a coarser texture
5. well-rounded gravel in a matrix of sand, clay, and natural cementing agents
8. solidify from molten material that flows over the earth’s surface, which is lava
9. dense, black, massive rock, high in calcium and iron, low in quartz content
11. similar to slate but has a satin-like sheen on its planes
12. same texture as granite but has the mineral composition of an andesite
13. form from molten material, also called magma and flows and solidifies underground
16. Wind, water, and ice break down existing rock into sediment
20. crystals in marble are large and interlocking, forming a dense crystalline rock

1. grained, dense, and brittle and is a metamorphosed form of shale
3. solidified from a molten or partially molten state
6. composed of more than 50% calcium carbonate and contains rock fragments, clay, quartz, and seashells
7. any rock type that has been altered by heat, pressure, or chemicals
10. typically a fine-grained, white, pink, or gray rock and is high in quartz
14. high-grade metamorphic rock. Has a rock a banded look of dark
15. same satin-like sheen as phyllite but has a coarse texture due to its high mica content
17. a higher quartz content than basalt and is usually lighter in color
18. solid material forming part of the surface on the earth
19. composed of cemented sand grains and is a cliff-forming rock commonly seen in southern Utah