Approximately what percentage of the estimated age of Earth does the Cenozoic Era represent and how do you

know? look at pg. 9 in Earth Science Reference Tables?

a. 1.4%
b. 5.0%
c. 11.9%
d. 65.0%

a. 1.4 percent

We don't have page 9 in the Earth Science Reference Tables.

Why did you post this question here?

To find the percentage of the estimated age of Earth that the Cenozoic Era represents, we can refer to the Earth Science Reference Tables, specifically page 9.

According to page 9 of the Earth Science Reference Tables, the estimated age of Earth is approximately 4.6 billion years, and the Cenozoic Era spans from about 66 million years ago to the present.

To calculate the percentage, we can use the following formula:

(Length of the Cenozoic Era / Estimated age of Earth) x 100

Length of the Cenozoic Era = present time - 66 million years

Estimated age of Earth = 4.6 billion years

Length of the Cenozoic Era = (2021 - 66 million years) years = 2021 - 66 = 1955 years

Therefore, (1955 / 4.6 billion) x 100 = 0.0425 x 100 ≈ 4.25%

So, the Cenozoic Era represents approximately 4.25% of the estimated age of Earth.

The closest option among the given choices is option b. 5.0%.

To determine the answer, we need to consult the Earth Science Reference Tables. Specifically, page 9 contains the Geologic Time Scale, which will provide the necessary information.

To obtain a copy of the Earth Science Reference Tables, you can use the following steps:

1. Open a web browser.
2. Search for "Earth Science Reference Tables."
3. Look for the official website of the organization or institution that provides the most recent version of the reference tables.
4. Access the website and navigate to the section where the Earth Science Reference Tables are available.
5. Locate the Earth Science Reference Tables document and click on it to open it.

Once you have the Earth Science Reference Tables open, navigate to page 9. Look for the section that displays the Geologic Time Scale. This scale illustrates the various eras and their corresponding durations.

Now, find the duration of the Cenozoic Era and compare it to the estimated age of the Earth. Calculate the percentage of the Cenozoic Era by dividing its duration by the estimated age of the Earth and multiplying by 100.

After performing these steps, you will be able to determine the correct answer from the given options - a. 1.4%, b. 5.0%, c. 11.9%, or d. 65.0%.