1. Rock Layers

2. The study of the history and changes to the Earth’s surface.
Geology
The study of the history and changes to the Earth’s surface.

3. The making of sediments through weathering and erosion.
Sedimentation
The making of sediments through weathering and erosion.

4. Sediments are dropped or placed in layers.
Deposition
Sediments are dropped or placed in layers.
These layers are called STRATA.

5. Processes are happening the same today as they were forever.
Uniformitarianism
Processes are happening the same today as they were forever.

6. Finding probable age of rocks by comparing them to each other.
Relative Rock Age
Finding probable age of rocks by comparing them to each other.

7. The Law of superposition
Older layers are placed first, so they are further down in the ground.

9. Magma rises up between already formed layers of rock.
Intrusion
Magma rises up between already formed layers of rock.

12. When the rock record has a gap or rock age is different than expected.
Unconformity
When the rock record has a gap or rock age is different than expected.

14. Types of unconformities
Disconformity
Angular Unconformity
Weathering and erosion happen before a new layer is deposited.
Different angle than the rocks above it.

16. Impression or remnant of a former living organism.
Fossil
Impression or remnant of a former living organism.

17. Paleontology
The study of fossils.