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Unit 3 Earth History

QuestionAnswer
Relative Dating determining whether one geological or paleontological event happened before or after a second event
Absolute Dating measuring the physical properties of an object itself and using these measurements to calculate its age
Continental Drift the hypothesis that the Earth's continents have moved over geologic time relative to each other
Half-Life the time required for a quantity to reduce to half of its initial value
Mass Extinction a widespread and rapid decrease in the biodiversity on Earth
Intrusion liquid rock that forms under Earth's surface. Magma from under the surface is slowly pushed up from deep within the earth into any cracks or spaces it can find, sometimes pushing existing rock out of the way
Fault Line A fracture or shift in the rock, caused by the movement of rock
Law of Superposition The rock layers on the bottom are OLDER than the layers on the top.
Law of Original Horizontality Rock layers deposit horizontally (flat) at first. Any tilting, or bending of the rock must have happened AFTER the layers were formed.
Law of Cross-Cutting Relationships Any event that goes through layers of rock must have happened AFTER the rock layers were already formed.
Alfred Wegener A German Scientist who came up with the the theory of continental drift and found evidence to support it
Evidence to Support Continental Drift Past Climate Data Fossil Evidence Rock Evidence Coastlines
Why did scientists not believe Wegener's theory at first? He could not explain how the continents drifted
Created by: AFrazierES8
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