The Geologic Time Scale A history of the Earth How old is the - - PowerPoint PPT Presentation

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Mar 15, 2023 592 likes •831 views

The Geologic Time Scale A history of the Earth How old is the Earth? 4.6 billion years! 4,600,000,000 Divided into eras: Precambrian Paleozoic Mesozoic Cenozoic 1.8 million years 4 x 1.8 = 7.2 million

SLIDE 1

The Geologic Time Scale

A history of the Earth

SLIDE 2

How old is the Earth?

4.6 billion years!
4,600,000,000
Divided into “eras”:

– Precambrian – Paleozoic – Mesozoic – Cenozoic

SLIDE 3

SLIDE 4

1.8 million years 4 x 1.8 = 7.2 million years

SLIDE 5

SLIDE 6

How long was the Paleozoic? 544 MYA - 245 MYA

SLIDE 7

How long was the Paleozoic? 544 MYA - 245 MYA

SLIDE 8

299 million years

SLIDE 9

How long was the Precambrian? 299 million years

SLIDE 10

4,056 million years 299 million years

SLIDE 11

War n i n g: No t t o Sc al e!!

SLIDE 12

To scale?

SLIDE 13

To scale?

SLIDE 14

SLIDE 15

How big was a a Sauroposeidon?

SLIDE 16

A scale timeline

To appreciate the times involved in Earth’s

history, we will make two scale timelines

A set distance on the timeline represents the

same amount of time (E.g. 1 cm = 1 year)

Example: If this line represents your K-12

school career, where would you be now?

K 12

SLIDE 17

K 1 2 3 4 5 6 7 8 9 10 11 12

A scale timeline

To appreciate the times involved in Earth’s

history, we will make two scale timelines

A set distance on the timeline represents the

same amount of time (E.g. 1 cm = 1 year)

Example: If this line represents your K-12

school career, where would you be now?

SLIDE 18

Scale Timeline of Earth’s History Part I: Outdoor Timeline

How old is Earth?
4,600,000,000 years old

(4.6 billion years)

Today’s time line scale: 1m = 100 million

years

4.6 billion years = 46 meters

SLIDE 19

Ground Rules

We stay together - no stragglers!
When I talk, you listen
Stay with your table partner and make

decisions as a pair

SLIDE 20

SLIDE 21

Scale Timeline of Earth’s History Part II: Paper Timeline

Today, you will create a scale timeline of

Earth’s history on a long sheet of adding machine paper

Scale: 1 inch = 100,000,000 years
4.6 billion years = 46 inches
E.g. Mr. Inman’s mother was born

1,625,000,000 years ago. Where would this be on the time line?

SLIDE 22

Scale Timeline of Earth’s History Part II: Paper Timeline

You may use:

Meter sticks (even though we’re using inches)
Decimal inch rulers
Your textbooks
Copies from other textbooks
The internet
You may compare your timeline to my sample,

but you can’t take a pencil there when you go!

SLIDE 23

Scale Timeline of Earth’s History Part II: Paper Timeline

To clean up:

Return

– Meter sticks (even though we’re using inches) – Decimal inch rulers – Your textbooks – Copies from other textbooks

Leave the computers running and open, but shut

down the internet

One member of each pair will keep the timeline

until tomorrow

Go back to original seats