Relative & Absolute
Is this relative or absolute age?
Tommy is 3 years old.
Absolute
How is sedimentary rock formed?
Deposition, Compaction, Cementation
What is the absolute age of Earth?
4.6 Billion
What can be used to mark the beginning or ending of a specific period of time?
a benchmark (supervolcano, asteroid, mass extinction)
What are the smallest units of time on the geologic time scale?
epochs
Is this relative or absolute age?
My brother is older than me.
Relative age
What is the rock record?
All of Earth's known rocks and the info they contain
What are some examples of slow geological changes?
weathering a mountain, sandstone scraping rock, glaciers carving valleys
What is the main purpose of the geologic time scale?
used to organize Earth's long history into manageable parts
What are the biggest units of time on the geologic time scale?
eons
What is relative age?
How old something is compared to how old something else is
What is the fossil record?
All of Earth's known fossils and the info they provide
What is an example of a fast geological change?
Earthquake, volcanic eruption, landslide
What are the divisions of the geologic time scale?
Eons, Eras, Periods, Epochs
When was the end of the Cretaceous Period end?
65 mya
What is relative dating?
Any method of determining whether something is older or younger than something else
How do scientists know which rock layer is the oldest?
The one of the bottom formed first
What is an unconformity?
A gap in the rock record
What Epoch, Period, Era, and Eon do we currently live in?
Phanerozoic Eon, Cenozoic Era, Quaternary Period, Holocene Epoch
When did the Neogene Period End?
1.5 mya
What is absolute age & what is absolute dating?
AA - actual age of something
AD- any method of measuring the age of an event or object in years
What is an index fossil?
A species that existed on Earth for a short period of time, were abundant, widespread geographically
What did scientists use to find the age of the Earth?
Meteorites because Earth was formed at the same time as these
What are the eons in the Precambrian Supereon?
Hadean, Archean, Proterozoic
Come up with 2 real life of examples of relative age and absolute age.
Answers will vary