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WorksheetsUnit 4 - Geologic Time
Total questions: 22
Worksheet time: 5hrs 52mins
What is the name of the most recent era in geologic time?
Precambrian
Paleozoic
Mesozoic
Cenozoic
Which era lasted the longest?
Cenozoic
Mesozoic
Paleozoic
Precambrian
The Earth is _____________________ years old.
4.6 million
4.6 billion
4.6 trillion
4.6 zillion
What is stratigraphy?
the study of the fossilized remains of plants and animals
the study of the layers of rock
the study of how the continents have moved and are still moving
the study of how carbon is stored in Earth's permafrost
What is the Law of Superposition?
All principle that states that rock layers were formed as horizontal layers
A gap in rock layers due to erosion of a weak layer of rock
A principle that states that an intrusive layer of igneous rock will always be younger than the rock it cuts through.
A principle that states that the deeper a rock is, the older it is unless it has been disturbed or altered.
What is the Law of Original Horizontality?
All principle that states that rock layers were formed as flat layers
A gap in rock layers due to erosion of a weak layer of rock
A principle that states that an intrusive layer of igneous rock will always be younger than the rock it cuts through.
A principle that states that the deeper a rock is, the older it is unless it has been disturbed or altered.
What is Relative Age Dating?
The dating of rocks in how they compare to the rocks that are around them.
The use of fossils to help find the age of a rock.
The use of radioactive elements in rock to find a highly accurate estimate of the age of the rock.
Dating of a rock layer based on how far it is from Earth's core.
What is Absolute Age Dating?
The dating of rocks in how they compare to the rocks that are around them.
The use of fossils to help find the age of a rock.
The use of radioactive elements in rock to find a highly accurate estimate of the age of the rock.
Dating of a rock layer based on how far it is from Earth's core.
Which layer is the oldest?
E
A
B
C
D
Fossils such as footprints, burrows or droppings.
Index Fossils
Unconformities
Petrified Wood
Trace fossils
Fossils made from organisms that were fairly common and existed only during a certain span of time, used to determine the age of rock layers.
Index Fossils
Unconformities
Inclusions
Trace Fossils
Fossils tell us what? Check all that apply.
How species have change overtime
How old species are by the layers they are contains
How Earth has changed overtime
What species have went extinct
Mass Extinction is best defined as....
Complete loss or death of a species
an abnormally large amount of species die out simultaneously or within a short period of time
Change in global or regional climate patterns
Change in climate during which glaciers covered much of the Earth
Life during the Precambrian was complex and diverse, but life was small and simple in the Mesozoic Era
True
False
The mass extinction event at the end of the Paleozoic era where more than 95% of all marine species went extinct was a result of a rapid climate change caused by the release of __________ from massive volcanic eruptions. The increase in this gas is also happening today as a result human activities (burning fossil fuels and coal).
oxygen
carbon dioxide
hydrocarbons
nitrogen
Fossils can only be found in this type of rock.
metamorphic
sedimentary
igneous
asteroids
What type of event usually marks the end of an Era
A Mass Extinction
A Quinceanera
An earthquake
A Volcanic Eruption
The dinosaurs and reptiles were dominant in which Era?
Precambrian
Mesozoic
Paleozoic
Cenozoic
Most of the evolution of life on Earth took place __________ in geologic time.
long ago
recently
today
within the last million years
Think about plants and animals moving on to land. Why
do you think the animals came second?
Explain how the presence or absence of certain organisms in layers lets us know that the climate may have changed.
