Eon

High school (ages 12+)
Mathematics & Numbers

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/eon

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the primary geologic time unit?Eons are the largest divisions of geologic time, representing billions of years
2. What is the earth's formation date?Eons commenced with the formation of Earth approximately 4.5 billion years ago
3. How long does an eon last?An eon can last many billions of years, like a million birthdays all at once.
4. What are the main eons of Earth's history?The main eons are the Hadean, Archean, Proterozoic, and Phanerozoic. Each eon has its own special changes.

Stratigraphy: The study of rock layers and layering (strata) to understand Earth's history and geological events.
Prokaryotes: Single-celled organisms lacking a nucleus and other membrane-bound organelles, like bacteria.
Eukaryotes: Organisms whose cells contain a nucleus and other membrane-bound organelles, forming the basis of multicellular life.
Mass Extinction: A widespread and rapid decrease in the biodiversity on Earth, often caused by catastrophic environmental events.