WorksheetsUnit 8 Practice Test
Total questions: 15
Worksheet time: 8mins
The geologic cross section below shows several rock units of
Earth’s crust. Some rock units are labeled A through E.
Which two rock units formed from Igneous Rock Intrusions?
C, D
A, E
D, A
B, E
Geologic history is divided into eras, periods, and epochs
based on the...
type of rock deposited at different times throughout
history
half‐life of radioactive isotopes found in rocks
inferred movements of Earth’s landmasses
fossil evidence found in bedrock
A cross section of Earth’s crust is represented below. Index
fossils are present in some of the rock layers.
These rock layers indicate evidence of past crustal movement
based on the principle of
up welling
Contact Metamorphism
Original Horizontality
Cross Cutting
In the cross section shown, if layer 2 is 299-318 million years
old, and layer 7 is 488-542 million years old, which of these is
most likely correct?
Layer 2 is younger than layer 1
Layer 3 is 317 million years old
Layer 4 is less than 318 million years old
Layer 5 is younger than layer 6
A fossil that contains carbon‐14 is found. Carbon‐14 has a
half‐life of 5730 years. If the bone has 50% of its carbon 14
remaining, how many half‐lives have gone by?
1
2
3
4
Volcanic ash has occasionally formed molds of animals. This
occurs when the ash covers the animal and —
replaces the animals soft tissue
enters the animal's body
Hardens before the animal's body decays
Mineralizes the animal's bones
The cross sections represent three bedrock outcrops, 1, 2, and
3, found several kilometers apart. The geologic time period
when each sedimentary rock layer formed is shown. The
symbols represent fossils of different types of organisms
present in the rock layers.
Fossils from which time period could not be dated using
carbon-14?
Cambrian
Mississippian
Pennsylvanian
Permian
In the illustration, which layer is an example of an intrusion?
3
2
1
4
Which of the following most likely results in the formation of a
fossil?
A Mesozoic clam is buried by a mudslide
A Mesozoic clam is eaten by a large predatory fish.
A Mesozoic clam is washed up onto the beach.
A Mesozoic clam lies exposed on the surface of the sea
floor.
Which aspect of this rock formation occurred at the earliest
time?
A. The
The top sedimentary layer labeled A
The igneous intrusion labeled B
The fault labeled C
The folding of the layers labeled D
Most modern geologists have argued that a global catastrophe
may have caused the extinction of the dinosaurs. According to
these scientists, what was this catastrophe?
An asteroid impact with the Earth
Melting of the polar ice caps
A shift in the tilt of the Earth
Earthquakes and volcanoes
Rocks found on land are up to 3.8 billion years old, but those in
the ocean are no more than 180 million years old. Using the
information shown, during which era could parts of the ocean
floor have formed?
Triassic
Mesozoic
Paleozoic
Precambrian
The diagrams show that as life forms changed on Earth so did
the composition of the atmosphere. The correct order of
these changes over geologic time is……
4, 3, 2, 1
2, 3, 1, 4
3, 4, 2, 1
3, 2, 1, 4
Which pie graph best shows the relative length of time of the
major intervals of Earth’s geologic history?
Which rock unit was formed most recently?
A
F
L
M
