# Science

The length of a football field is 100 yards. When you compare geologic time (4.6 billion years) to
the length of a football field, you will find that each yard on the field will equal 46 million years,
and each 10-yard section will equal 460 million years. Use this information to complete the
activity below.
Create a digital model of a football field. Starting at the left and moving forward in time, label the
10-yard lines in years. Using different colors, draw a horizontal line to mark the beginning and
end of each of the following periods and eras [note that the years have been rounded up for this
activity]:
• Cenozoic era (65 MYA to present)
• Cretaceous period (146‒65 MYA)
• Jurassic period (208‒146 MYA)
• Triassic period (245‒208 MYA)
• Paleozoic era (570‒245 MYA)
• Proterozoic era (2,500‒570 MYA)
• Archean era (3,800‒2,500 MYA)
For example, to calculate where to mark the Cenozoic era, calculate:
⋅ ≈ 1 yard 65 million years 1.4 yards 46 million years
The Cenozoic era should be marked approximately 1.4 yards from the right end of the football field.

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3. 👁 1,089
1. The length of a football field is 100 yards. When you compare geologic time (4.6 billion years) to
the length of a football field, you will find that each yard on the field will equal 46 million years,
and each 10-yard section will equal 460 million years. Use this information to complete the
activity below.
Create a digital model of a football field. Starting at the left and moving forward in time, label the
10-yard lines in years. Using different colors, draw a horizontal line to mark the beginning and
end of each of the following periods and eras [note that the years have been rounded up for this
activity]:
• Cenozoic era (65 MYA to present)
• Cretaceous period (146‒65 MYA)
• Jurassic period (208‒146 MYA)
• Triassic period (245‒208 MYA)
• Paleozoic era (570‒245 MYA)
• Proterozoic era (2,500‒570 MYA)
• Archean era (3,800‒2,500 MYA)
For example, to calculate where to mark the Cenozoic era, calculate:
⋅ ≈ 1 yard 65 million years 1.4 yards 46 million years
The Cenozoic era should be marked approximately 1.4 yards from the right end of the football field.

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2. 👎 2
2. @ddd why did you just copy and paste what Brosive said?

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3. So like no help??

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4. I can tell that you, like me, are a connections academy student. I am struggling with the same issue, but for some help, I would recommend that you go to Message Boards>Portfolios>Telling Earth's Story Portfolio. There are then two options for help (I recommend the non-alternative one). Hope this helps!

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5. im from connections, and these sights barely help, and just make me fail

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2. 👎 0

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