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History of the Earth

Published on Mar 16, 2016

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1.

History of the Earth

Photo by Kevin M. Gill
2.

4.6 billion years old

Big Bang Theory, same age as Solar System
3.

Geological Time Scale

Summary of Major Events in Earth's History
4.

Eon

  • Largest segment of time
  • billions of years long
Photo by NASA Goddard Photo and Video
5.

Era

  • Well defined time span
  • Has a start event and end event
  • Ex: Paleozoic
Photo by kevinzim
6.

Period

  • Smaller subdivision of an Era
  • Used to help cross reference dates using rocks
  • Ex: Jurassic Period
7.

Epoch

  • Smallest period of time
  • Divided into ages
  • Ex: Pleistocene Epoch
8.

Reading the Rock Record

  • Use rocks to determine the age of an object/organism
  • 2 types: Absolute and Relative
9.

Dating Methods

10.

Law of Superposition

  • Relative Time
  • Law Of Superposition: IN UNDISTURBED ROCKS, the rocks at the bottom are the oldest and the ones on top are the youngest
11.

Theory of Uniformitarianism

  • Earth changed slowly in the past and is still changing today

Allison Spillman