Rocks

3. - Type of sedimentary rock formed from the accumulation and cementation of organic remains (10 letters)
7. - Texture characteristic of certain metamorphic rocks with a layered or banded appearance
8. - Hollow rock formation with a cavity lined with crystals or other mineral matter
11. - Process by which rocks are broken down and worn away by exposure to the elements
12. - Type of sedimentary rock formed by the precipitation of minerals from solution
14. - Fine-grained sedimentary rock often used in roofing and as a source of oil and natural gas (5 letters)
15. - Naturally occurring solid with a definite geometric shape and a regular internal arrangement of atoms (7 letters)
17. - Sedimentary rock often used in construction and characterized by its grainy texture
18. - Texture characteristic of certain metamorphic rocks lacking a layered or banded appearance (11 letters)
19. - Type of igneous rock formed from magma that solidifies below the Earth's surface

1. - Type of sedimentary rock composed of fragments or clasts derived from pre-existing rocks
2. - Another type of sedimentary rock composed of rounded fragments cemented together (12 letters)
4. - Preserved remains or traces of ancient organisms found in sedimentary rocks
5. - Type of rock formed from pre-existing rocks through heat, pressure, or chemical processes (12 letters)
6. - Geological process involving the transformation of rocks between three main types: igneous, sedimentary, and metamorphic (8 letters)
9. - A type of sedimentary rock composed of angular fragments cemented together (7 letters)
10. - Type of rock formed from the solidification of molten material
13. - Type of igneous rock formed from lava that solidifies on the Earth's surface (9 letters)
16. - Earth's building blocks, formed through natural processes (4 letters)
20. - Type of rock formed by the accumulation and compression of sediment over time (10 letters)