Extinctions
All the Time
Earth Through Time
Everything Living
and not living too
100
What occurs when a large number of species occur during a relatively short period of time?
mass extinction
100
The largest division of the geologic time scale is the era is an __.
Eon
100
What do we call the time when Earth was all one land mass?
Pangaea
100
In what geologic period are all things living today?
Quaternary period
100
Determining whether a fossil formed before or after another fossil is:
relative dating
200
During which period did the dinosaurs become extinct? [double click if you can tell how long ago they became extinct]
Cretaceous and Tertiary (tricky right!)
65 million years ago (more or less)
200
In what Era do we currently live? [double click if you give the period; triple click if you give the epoch]
Era - Cenozoic
Period - Quaternary Epoch - Holocene
200
Pangaea occurred between 280 MYA and 230 MYA. What organisms dominated at that time?
reptiles OKA dinosaurs!
200
Most fossils are preserved in __ rock.
sedimentary rock
200
What do we call a scientist who studies the history of life on Earth through the fossil record?
a Paleontologist
300
Which mass extinction killed the highest percentage of species?
Permian extinction (95%)
300
What does relative dating tell you about fossil 'C'.
It's older than fossil A and B, and younger than fossil D.
300
The Earth has changed from Pangaea to the present configuration because of what process? [hint: mantle ___]
convection
300
What organisms dominated during the Mesozoic Era?
[double click if you can name it's three periods]
dinosaurs!
Triassic, Jurassic, Cretaceous
300
What process determines the age of a fossil in years?
[double click if you can tell what kind of material is used to find the ages]
absolute dating
radioactive materials
400
Which mass extinction led to the death of Crinolds?
became:
400
How old is Earth according to the scale?
4.5 billion years old
[4,540 thousand million years old]
400
These occur most often at boundaries between tectonic plates, mostly along a belt, called the “Ring of Fire” that encircles the Pacific Ocean.
What are they called?
volcanoes
400
What two divisions of the Geologic Time Scale are determined by the life that dominated then?
Eras and Periods
400
What is an example of an event that could cause a mass extinction?
increased volcanic activity
an asteroid collision meteor showers solar super flare
500
Name three organisms that became extinct during the Ordovician extinction.
too many to type
500
When did the Paleozoic Era begin and end?
450 MYA - 250 MYA
500
What mountain range began when the Indian Plate collided with the Eurasian plate?
[double click if you can tell what type of mountains]
Himalayan
folded mountains
500
Name this index fossil.
[double click if you can tell what an index fossil is]
Trilobite
Index Fossil - any fossil that is characteristic of a particular geologic time period
500
Why is it difficult to tell which fossils are older?
The layers of strata are broken, uplifted and subsided.