Chapter 4 Geologic Time - Christina Doudakis
Storyboard Text
- Yeah sure! Come right ahead and join us!
- Hey guys! Can I join you?
- So Geologic Time is the large amount of time taken by the geologic history of Earth? Am I right?
- So what are you guys talking about?
- Yes you are right Sammy good job!
- Oh, Alex was explaining to me about Geologic Time.
- Geologic time begin at the start of Archean Eon which it was 2.5 - 4.0 bil. years ago. And it still goes on to this day.
- This sounds great! But I have a question. I don't remember the Archean Eon. Can you explain it to me please?
- The geologic time is known as a "calendar" for events in Earth's history.
- The Archean Eon was 4.6b - 541m years ago. It was when life started forming on Earth!
- Via the more knowledge you get the cutter you are becoming!
- Um . Aghhh, th- thank- thank you?
- Awww Via is blushing!
- Geologists use radiometric dating methods of certain elements like potassium as clocks to date ancient events.
- Now Via you need to understand some other things like "how are fossils use to date the Earth's age"?
- Next up is "Absolute Age" is the age of a geologic phenomenon measured in present Earth years.
- Now fossils that are used to support plate tectonics are glaciers and complimentary coastlines. This fossils help as what kind of plants and animals once existed.
- Now "Relative Age" is the geologic age of a fossil organism, rock, geologic feature, or event.
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