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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?”
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.
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.
Fossil Dating. HOW DO WE KNOW THE AGE OF FOSSILS? -Scientists use 2 methods to determine the age of fossils: 1. Relative Dating 2. Absolute Dating.
GEOLOGIC PRINCIPLES & RELATIVE DATING. HOW OLD IS THE EARTH? The Earth is about 4.6 billion years old Much of its history is recorded in the rocks Observations.
Geology. The study of the solid Earth and the processes that shape it – Plate tectonics – Past climates – Natural disasters – Fossil Record – Evolution.
Discovering Earth’s History Rocks Record Earth’s History 1. Rocks record geological events and changing life forms of the past. 2.Scientists have learned.
The principle of uniformitarianism Uniformitarionism is a principle that states that the same geologic processes shaping the earth.
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