Stratigraphy
Time Period
Relative and Absolute Dating
Vocabulary
Miscellaneous
100
The study of rock layers that is part of geology is known as
Stratigraphy
100
How old is the Earth
4.6 billion years old
100
Saying you are older than a baby is an example of relative dating or absolute dating ?
Relative Dating
100
Sedimentary Rocks
Rocks made from sediments deposited by wind, water, etc.
100
T/F ? When a whole species dies all at once it is called a mass extinction
True
200
What are Strata ?
Strata are rock layers.
200
During what period did dinosaurs rule the Earth?
Mesozoic
200
Absolute dating is also known as what?
Radiometric and radioactive dating
200
Chronological
occurring or going in order of time
200
What evidence do scientists use to determine the age of the Earth?
Index Fossils, Earth Strata, Radioactive Dating, Relative Dating
300
What is the law of superposition
It states that the layer on top is younger than the layers on the bottom.
300
Most of the history of life on the earth has only occurred recently. True of False
True
300
Layer C
300
Law of Lateral Continuity
a sedimentary rock layer that extends sideways as wide as the basin in which it forms.
300
What characteristics must index fossils have ?
Recognizable, short life-span, wide distribution
400
Explanation of why layers of the earth might be altered include: The law of superposition, The law of gravity and the law of motion, Principle of Cross-Cutting relationships, Radioactive Isotopes
Principle of Cross-Cutting Relationships
400
What era are we currently in ?
Cenozoic
400
What is relative age ?
When comparing two rock layers to see which is older or younger.
400
Unconformity
A lack of continuity in deposition between rock strata
400
What are some things we can learn from studying the rock layers
Climate, environment, age of rocks, animals and plants that lived there
500
If the same index fossils are found in different rock strata miles apart, what is probably true about the rock layers?
The strata are from the same relative time period
500
What time period lasted the longest ?
Precambrian Time
500
What is absolute dating ?
Absolute dating is finding the exact age of a rock or a rock layer
500
Principle of cross-cutting relationships
If there is an igneous intrusion or a fault it is younger than the layers around it
500
What leads to diversity of life and why?
Sexual reproduction, genetic variation from two parents