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Relative Dating of Rocks Layers
Age of Earth Early 1900s: 6000 years old Today: 4.6 billion years oldHow did scientist come up with this number? Relative Age Dating Absolute Age Dating
Developed the principle of uniformitarianismJames Hutton (1700s) Developed the principle of uniformitarianism processes occurring today have been occurring since Earth formed.
1) Relative Age Dating Comparing one rock layer to another. Sequences the order of events No exact dates Easy comparison of fossil ages
Geologic Principles Original Horizontality – sedimentary rocks are deposited in horizontal layers.
Superposition – in an undisturbed rock sequence:Oldest rock layers are at the bottom Youngest layers are on top
Law of Superposition L U M X S Which layer is the oldest?Which layer is the youngest? Would the fossils in rock layer “U” be older or younger the fossils in rock layer “X”? How do you know?
Relative and Absolute Age Law of Superposition
“How can scientists determine the age of rocks and fossils?”
Age Dating of Rocks.
Unit 6 – The Geosphere Vocabulary
We know it’s BIG…but HOW do we know that?
Using the rock record to age date rock layers
Relative and Absolute Dating
Relative Dating of Rocks
1) What is uniformitarianism?
Relative and Absolute dating You know your old when……
Relative Age Dating Activity.
FINDING RELATIVE AGE. What is relative age? 1. The age of a rock compared to the ages of other rocks. Absolute age-the EXACT age of rock (add to your.
Determining the Age of Rocks Relative Age of Rocks.
RELATIVE TIME: When the age of rock is compared to the ages of other rocks or events in geological time. Can determine which layers are older than others.
Section 4.2 The relative age of a rock is its age compared to the ages of other rocks. Ex. Mrs. Herrscher is older than her sister and brother.
GEOLOGIC HISTORY THE RULES OF THE GAME
Unit 5: Age of the Earth Objective:
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