Science

4. the type of rock that forms from other rocks as a result of intense heat, pressure, or chemical processes usually a distorted form of sedimentary rock
5. the scientific study of the origin, history, and structure of Earth and the processes that shape Earth
6. the type of rock that forms when magma cools and solidifies
7. an acronym for weathering, erosion, deposition, compaction, and cementation
12. a principle that geologic processes that occurred in the past can be explained by current geological processes; opposite to catastrophism
15. formed from one or more minerals
17. the theory that Earth has been affected in the past by sudden events; Opposite to uniformitarianism
19. the type of rock that forms from compressed or cemented layers of sediment
20. the series of processes in which rock forms, changes from one type to another, is destroyed, and forms again by geologic processes

1. when rock layers tilt to one side making them diagonal
2. an arrangement of rock layers based on relative ages in which the oldest rocks are at the bottom
3. an indefinite and very long period of time
8. a long and distinct period of history with a particular feature or characteristic
9. a break in the geologic record
10. the standard method used to divide Earth's history into smaller parts
11. a disaster; sudden
13. any method of figuring out whether an event or object is older or younger than other events or objects
14. a principle that states that younger rocks lie above older rocks if the layers have not been disturbed
16. a tree resin (like sap) that preserves fossils
18. the trace or remains of an organism that lived long ago