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Your assignment, due at the end of class today, is to produce a visual metaphor scaled to the geologic time scale that reflects some of the important events in the history of Earth. Include 3 or 4 dated events from the list below, anchoring your metaphor between 4.6 billion years ago and today. Your metaphor might be geologic time scaled to your height, the 24 hours of a day, the length of one Earth year, or the distance from San Francisco to Los Angeles—whatever you can imagine. Try to be distinctive and make your TA smile.

- 4.6 billion years ago (b.y.a.): Birth of the Solar System and Earth
- 4.48 b.y.: Oldest moon rocks
- 4.0 b.y.: Oldest rocks recognized on Earth
- 3.5 b.y.: Oldest recognizable fossils of single-celled bacteria
- 1.5 b.y.: Oldest recognizable single-celled organisms with nuclei
- 1.0 b.y.: Origin of sexual reproduction
- 700 million years ago (m.y.a.): First multi-celled animals
- 540 m.y.: First animals with hard shells living in shallow oceans
- 480 m.y.: First fish
- 420 m.y.: First land plants (invasion of the land begins)
- 380 m.y.: First amphibians
- 320 m.y.: First reptiles
- 250 m.y.: Largest mass extinction in Earth's history—over 90% of species go extinct
- 210 m.y.: First dinosaurs
- 160 m.y.: First birds
- 66 m.y.: Mass extinction, including dinosaurs—mammals radiate after this extinction
- 3-4 m.y.: Early hominids (precursors to modern humans)
- 2 m.y.: Modern Ice Ages begin
- 0.010 m.y.: Advent of agriculture and civilization as we know it

Use the simple equation below and show your work. Feel free to draw your metaphor by hand or describe it in words. Put it all on one or two pages to be submitted to your TA at the end of class.

For example, if a football field is your metaphor, and you want to find out what yard line the "first atmospheric oxygen" is on, then your calculation would look like this:

\[ \text{known first oxygen} = 2 \times 10^9 \text{ years ago} \]
\[ \text{unknown (X) first oxygen location on football field} \]
\[ \text{known age of Earth} = 4.6 \times 10^9 \text{ years ago} \]
\[ \text{football field length} = 100 \text{ yards} \]

In your response, include a short answer to the question below:

If you had to find the one take-home message from this exercise, what might it be?

Answer :

The question asks for a visual metaphor that represents important events in the history of Earth, using the geologic time scale as a reference. It suggests including 3 or 4 dated events from the provided list. The metaphor can be anything creative, like geologic time scaled to your height, the 24 hours of a day, or the length of one Earth year.


To create a metaphor using the geologic time scale, you can use a timeline as the visual representation. You can assign each event to a specific point on the timeline, based on its corresponding time period. For example, you can divide the timeline into equal sections and mark each section with a significant event from the list.

To calculate the position of an event on the timeline, you can use the provided equation:
known age of the event (years ago) / known age of Earth (years ago) = position on the timeline / total length of the timeline.

Let's say you want to find the position of the "first amphibians" event on the timeline. According to the list, it occurred 380 million years ago. The known age of the Earth is 4.6 billion years. Let's assume the total length of the timeline is 100 units (you can choose any value you prefer).

Using the equation, you can calculate the position of the event:
(380 million years ago / 4.6 billion years ago) = (position on the timeline / 100 units)

Simplifying the equation, you can find that the position on the timeline for the "first amphibians" event is approximately 8.3 units.

Repeat this process for 3 or 4 events from the list, and mark their positions on the timeline accordingly. This visual metaphor will help you represent the important events in the history of Earth, scaled to the geologic time scale.

As for the take-home message from this exercise, it could be that the history of Earth is incredibly long and complex, and our species, Homo sapiens, is relatively young in comparison. We have only been around for a very short period of time compared to the vast timeline of Earth's history. This exercise highlights the significant events that occurred throughout Earth's history and helps us appreciate the relatively recent development of our species.

To learn more about visual metaphor, visit here:

https://brainly.com/question/31533574

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