Geologic Timescale Evidence from absolute dating indicates that Earth is about 4

Question

Geologic Timescale Evidence from absolute dating indicates that Earth is about 4.5 billion years old. To help make sense of this vast amount of time, scientists use the geologic timescale to organize Earth's history. The geologic timescale divides Earth's history into intervals of time defined by major events or changes on Earth. The largest category of time is the eon, which is further divided into eras, periods, epochs, and ages Dividing that long period of time into smaller parts makes it easier for scientists to communicate their findings about rocks and fossils are based on 4,500 4,000 3,500 3,000 2,500 2,000 1,500 1,000 500 Present 200 100 Present 400300 Period 60 50 30 20 10 Present 40. Period Do the Math 1 Using Models The geologic time of Earth 4.5 billion years. Let a football field, which is 100 yards long model the number of years since Earth formed about 4,500,000,000 years 14. Using this data, how many years of Earth's history would each yard line on the spans more than football field represent? 15. The first modern humans appeared on Earth about 200,000 years ago. Would it be possible to measure that number in terms of feet on a football field? Explain your answer

Explanation / Answer

14) Given Length of the football field = 100 yards

Length of Geological time scale = 4,500,000,000 years

Let 1 yard of football field represent "x" years

we can write the above information as

100 yards --> 4,500,000,000 years

1 yard --> x years

=> x/4,500,000,000 = 1/100

=> x = 4,500,000,000/100

=> x = 45,000,000 years

Therefore, each yard on a football field would represent 45,000,000 years

15) Yes, it is possible to measure when humans came around in terms of football field

It is given that humans came around 200,000 years ago.

let us consider that it is "y" yards from the finish line of the football field to the time that humans arrived.

45,000,000 years = 1 yard

200,000 years = y yards

=> y = 200,000/45,000,000 = 0.004444 yards

We know that 1 yard = 0.33333 feet

=> y = 0.004444*0.33333 feet = 0.00148 feet

Therefore, 200000 years ago in geologic time scale represents 0.00148 feet from the finish line in the football field.

Related Questions

Navigate

• Browse (All)
• Browse G
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.