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Earth science 12.1

Earth science 12.1






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    Earth science 12.1 Earth science 12.1 Presentation Transcript

    • 12.1 Discovering Earth’s History
    • Uniformitarianism
      • The concept that processes that have shaped Earth in the past are essentially the same as those operating today
    • Relative dating
      • Process by which rocks are placed in their proper sequence or order; Only the chronological order of events is determined, not the absolute age in years.
    • unconformity
      • A surface that represents a break in the rock record, caused by erosion or lack of deposition
    • Correlation
      • Establishing the equivalence of rocks of similar age in different areas
    • Key Concept
      • Rocks record geological events and changing life forms of the past
    • Key concept
      • We have learned that earth is much older than anyone had previously imagined and that its surface and interior have been changed by the same geological processes that continue today
    • Key concept
      • Uniformitarianism means that the forces and processes that we observe today have been at work for a very long time
    • Key Concept
      • Relative dating tells us the sequence in which events occurred, not how long ago they occurred
    • Key Concept
      • The law of superposition states that in an undeformed sequence of sedimentary rocks, each bed is older than the one above it and younger than the one below it.
    • Key Concept
      • The principle of original horizontality means that layers of sediment are generally deposited in a horizontal position.
    • Key concept
      • An unconformity represents a long period during which deposition stopped, erosion removed previously formed rocks, and then deposition resumed.
    • Key Concept
      • An angular unconformity indicates that during the pause in deposition, a period of deformation (folding or tilting) and erosion occurred.