Vocab
Disturbing Rock Layers
Fossil and Rock Layers
Half-life
Review
100

The preserved remains of something that was once living.

A fossil.

100
Where are older rock layers always located?
Towards the bottom
100
This states that a crack or break in rock must be younger than the rock layer it cuts through
Crosscutting
100
How does sedimentary rock form?
weathering, erosion, deposition
100
The process of sediment collecting is called this.
Deposition
200
This is the process of determining the order of past events compared to other events.
Relative Dating
200
This is a break or crack in a layer of rock.
Fault
200
If a fossil is found in a particular rock layer, what can we say about both the fossil and the rock layer?
The formed at the same time.
200
What does a geologic column show us?
Which rock is younger and which rock is older
200
What is the process called that creates new ocean floor?
Sea Floor Spreading
300
This states that younger rocks always lie above older rocks.
Law of Superposition
300
This is when pieces of a rock layer shift up while other shift down.
Tilting
300
Fossil A is found near the surface of the ground. Fossil B is found much deeper down. Would these fossils have formed at the same time? Why/why not?
No, different layers
300
What must be present in order for an intrusion to form?
magma/igneous rock
300
The weather conditions in an area over a long period of time.
Climate
400
This is a break in the geologic record. (when a rock layer is missing)
An unconformity
400
When pressure pushes rocks together, this process begins to disturb rock.
folding
400
A fossil is found in a rock layer that is 5000 years old. How old might the fossil be?
Around 5000 years old
400
Would a piece of pottery be an example of a fossil? Why/why not
No, was never living.
400
This process cycles rock from the asthenosphere to the mesosphere in the mantle.
Convection
500

The law that states when events such as an intrusion/extrusion or faults cut through other rocks or events, that they will be younger than any event they cut through

Law of Crosscutting Relationships

500
What are the five ways that rocks are disturbed?
Folding, Faulting, Tilting, Intrusion, Unconformities
500
When igneous rock forms inside of a fossil layer, what is it called?
Intrusion
500
What causes deposition to occur? (everything to settle in one location)
Gravity
500
What are the five ways that fossils are preserved
Buried in Rock, Petrified, Trapped in Asphalt, Trapped in Amber, Frozen
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