Geologic Time
Name _______________________
Geologic Time
Chapter 17 section 1
(This is transcribed from a Prentice Hall
read only slide show.)
Geologic Time Scale:
|Slide Number |Information |
|761 |To understand ________, it is important to realize that our ______________________. |
|762 |Modern methods of ______________________ put Earth’s age at _________________________. |
|763 |This immense time span is hard to comprehend. Guess about how long it would take just |
| |to count to 4.5 billion if you could count one number per second without stopping. |
| |__________ |
|764 |An appreciation for the magnitude of geologic time is important because many of |
| |_________________ ________________ that __________________ are needed for significant |
| |changes to occur. |
|765 |It took _______________________ to create these mountains and it will take |
| |_______________ ________________________________. |
|766 |Geologists have divided all of Earth history into units of varying magnitude. Together|
| |they comprise ____________________. |
|767[pic] |The _________________ provides a framework for arranging events of the |
| |_________________. |
|768 |_______ represents the _________________ |
| |_______. |
|769[pic] |The _________ that began about _____________ is called the Phanerozoic, |
| |__________________. |
|770 |The _________________________________ |
| |of Phanerozoic eon contain an ______________ __________________________. |
|771 |The Phanerozoic eon is divided into units called ______. |
|772 |The era names refer to import differences in dominant life-forms. |
| |______zoic refers to ancient life. Example Trilobite fossils. |
| |_____zoic refers to middle life. |
| |_____zoic refers to recent life. |
|773 |Each era is divided into smaller units called _________. |
|774 |The changing fossil record also played an important part in establishing each of the |
| |periods. |
|775 |Periods may be divided into epochs. Seven epochs are names for the periods of the |
| |Cenozoic era. |
|776 |The epochs of other periods usually are just _____ |
| |______________________________. |
|777 |The _____________________, which ended just 10,000 years ago, coincides with a time |
| |span commonly known ________________________. |
|778 |The detail on the time scale does not begin until about 540 million years ago, the date|
| |for the _____ |
| |______________________________. |
|779 |The vast expanse of time prior to the Cambrian Period is divided into three eons-the |
| |_______, the ___________, and the _______________. |
|780[pic] |This greater than 4 billion-year span is also commonly called the ________________. |
|781 |About what percent of Earth’s 4.5 billion-year history is represented by Precambrian |
| |time? _____ |
|782 |Why are the eons of Precambrian time not divided into numerous eras and periods? |
|783 |One reason is that __________________ was soft-bodied and therefore the fossil record |
| |is meager compared to the Phanerozoic eon. |
|784 |In addition, much of the Precambrian rock record is buried beneath younger rocks and/or|
| |altered by metamorphism. |
| |The Grand Canyon’s ancient Vishnu schist is buried beneath a huge pile of Paleozoic |
| |rocks. |
|785 |Which is the greatest expanse of time? _______ |
|786 |Which is a subdivision of an epoch? ___________ |
|787 |Mesozoic is an example of ________. |
|788 |Eons are divided into these _________. |
|789 |Which is the smallest time span on the geologic time scale? _______ |
|790 |Cambrian and Jurassic are examples of ________. |
|791 |The age of the Earth is about: ________________ |
|792 |The Phanerozoic eon began about years ago. |
|793 |We are presently living in the ____________ era. |
|794 |The Hadean, Archean, and Proterozoic are: ______ |
| |_______________________________________ |
| |__________________________________. |
|795 |Which era of the Phanerozoic eon has the most periods? _________________ |
|796 |Eocene, Pleistocene, and Holocene are examples of: __________ |
-----------------------
[pic]
[pic]
[pic]
................
................
In order to avoid copyright disputes, this page is only a partial summary.
To fulfill the demand for quickly locating and searching documents.
It is intelligent file search solution for home and business.