Across
- 4. hot fluid or semifluid material below or within the earth's crust from which lava and other igneous rock is formed on cooling.
- 5. The quality of being hot; high temperature
- 9. Formed from cooled and solidified magma, or molten rock
- 11. The remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock.
- 12. The theory that changes in the earth's crust during geological history have resulted from the action of continuous and uniform processes.
- 13. The process by which rocks, minerals, and other materials break down or change in composition, color, texture, or form at or near the Earth's surface
- 14. A long-lived naturally occurring radioactive carbon isotope of mass 14, used in carbon dating and as a tracer in biochemistry.
- 15. A solid collection of minerals.
Down
- 1. The time taken for the radioactivity of a specified isotope to fall to half its original value.
- 2. A person who studies or is an expert in the branch of science concerned with fossil animals and plants.
- 3. A method used to determine the age of an object or event in relation to other objects or events, without assigning a specific numerical age.
- 6. A fossil that is useful for dating and correlating the strata in which it is found.
- 7. Matter that settles to the bottom of a liquid; dregs
- 8. Formed when existing rocks are transformed into new types of rock through a process called metamorphism
- 10. A method for determining the age of an object or event in years