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Geologic Time Scale: Major Eons, Eras, Periods and Epochs

Geologists study layers of strata to learn about Earth's history. An eon spans hundreds to thousands of millions of years and is longer than an era, which spans tens to hundreds of millions of years. The Mesozoic Era was the Age of Dinosaurs, while the current Cenozoic Era is the Age of Mammals.

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52 views1 page

Geologic Time Scale: Major Eons, Eras, Periods and Epochs

Geologists study layers of strata to learn about Earth's history. An eon spans hundreds to thousands of millions of years and is longer than an era, which spans tens to hundreds of millions of years. The Mesozoic Era was the Age of Dinosaurs, while the current Cenozoic Era is the Age of Mammals.

Uploaded by

Darcy Evans
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Geologic Time Scale: Major Eons, Eras, Periods

and Epochs
Chapter 2 /  Lesson 1   Transcript
1. Why do many geologists study layers of strata?
a. They want to learn more about the history of the Earth.
b. They hope to discover Greek-era ruins.
c. They are interested in the exploitation of fossil fuels.
d. They are interested in determining how dinosaurs went extinct.
2. How does an eon differ from an era?
a. An eon spans hundreds to thousands of millions of years, while eras span tens to
hundreds of millions of years.
b. Eons measure the time during which humanity existed, while eras measure
everything since the Earth was formed.
c. Eons focus on the existence of Earth, while eras measure the passage of time from
the Big Bang.
d. An eon spans up to a million years, while eras span longer than 2 million
years.
3.  The Mesozoic Era was the Age of Dinosaurs, and the current
Cenozoic Era is the Age of _____.
a. Mammals
b. Birds
c. Ice
d. Human
4.

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