WorksheetsUnit 2: Section 1: Geologic Time Scale
Total questions: 23
Worksheet time: 12mins
The geologic time scale is divided into four large units known as
Eras
Eons
Periods
Units
What skill was used to create the geologic time scale?
Classifying
Pairing
Observing
Channeling
Scientists often use "mya" as an abbreviation for
Molecular Yields of Absolute
Meters You Access
Millions of Years Ago
Money You should Accept
How old do scientists believe the Earth is?
4.6 million years old
4.9 billion years old
4.6 billion years old
4.9 million years old
The oldest eon is
Hadean
Cenozoic
Phanerozoic
Archean
Why do we use a geologic time scale?
Measure how long Earth has existed
Describe how Earth has developed and changed
Recognize major events that have occurred on Earth
All of the above
How do scientists determine the number and length of time on the geologic time scale?
Gathering information from databases
Based on important events in earth's history
studying rocks in North America
Based on the time and distance that has passed
How many years ago did the Archean Eon end?
250 MYA
4000 MYA
2500 MYA
1000 MYA
The time span that lasted the longest was the?
Phanerozoic
Pre-Cambrian
Proterozoic
Paleozoic
Only unicellular organism existed during the Precambrian eon?
True
False
The supereon is made up of 4 eons
True
False
An era is subdivided into periods
True
False
The PreCambrian is the eon most studied
True
False
Cenozoic is divided into 2 periods
True
False
Division of Earth's history into time units based largely on the types of life forms that lived only during certain periods.
Phanerozoic Eon
Geologic Time Scale
Era
Single Cellular
A time period made up of more than one eon
Supereon
Era
Epoch
Period
Longest subdivision in the GTS that is based on the abundance of certain types of fossils and is subdivided into eras, periods, and epochs
Phanerozoic Eon
Geologic Time Scale
Period
Eon
Second longest division of geological time
Eon
Era
Period
Epoch
Third longest division of geological time; is subdivided into epochs and is characterized by the types of life that existed world wide.
Eon
Era
Period
Epoch
Smallest subdivision of geological time after the period; is characterized by difference in life-forms that may vary regionally.
Eon
Era
Period
Epoch
An organism that consist of only one cell
Phanerozoic
Unicellular
Multicellular
Epoch
An organism consisting of many cells
Multicellular
Unicellular
Phanerozoic
Epoch
the current geologic eon in the geologic time scale, and the one during which abundant animal and plant life has existed.
Supereon
Epoch
Pre-Cambrian Eon
Phanerozoic Eon
