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Worksheets8-2 Rock Layers
Total questions: 21
Worksheet time: 11mins
What is an intrusion?
magma that hardens into igneous rock below the surface
lava that hardens on the surface
a break in the Earth's crust
a rock within a rock
A fault is
magma that hardens below the surface
lava that hardens on the surface
a break in the Earth's crust
a rock within a rock
The Law of Superposition states that
the layer on the top is the youngest.
the layer on the bottom is the youngest.
all of the layers are the same age.
the layers in the middle are the youngest.
Saying that a rock is 10,000 years old is an example of
relative dating.
absolute dating.
a fossil.
an inclusion.
What is an extrusion?
a break in the Earth's crust
a rock within a rock
magma that has cooled and hardened below the surface
magma that pushes up to the surface and then cools and hardens on the surface
What is an inclusion?
a break in the Earth's crust
magma that cools and hardens below the surface
magma that hardens on the surface
a rock within a rock
Determining the absolute age of a rock is done
by comparing older and younger rock layers.
by radioactive dating.
using the law of superposition.
using index fossils.
Geologists believe that Earth is about
a million years old.
4.6 million years old.
4.6 billion years old.
4.6 trillion years old.
Is P older than M?
Yes because M is tilting down.
Yes, because M is on both sides of P.
No, because P is an intrusion that cuts through the rock layers.
No, because it is not possible to figure it out.
Index fossils are the fossils of organisms that lived for a short period of time and are found in many places. They are useful for figuring out
how many species lived on Earth.
the relative age of rock layers.
the absolute age of rock layers.
the age of Earth.
Which fossil is the best index fossil?
ammonite
fern
trilobite
gastropod
An example of relative age would be (check all that apply)
"The rock is 20,000 years old."
The rock is younger than the fossil.
Layer A is younger than Layer K.
The fault is younger than the intrusion.
A gap in the rock layers is called a(n)
fault.
extrusion.
unconformity.
intrusion.
Radioactive dating can be used for which type of rock?
igneous
metamorphic
sedimentary
all 3 types of rocks
Geologists can use radioactive dating to find the age of
rock layers A-E
the extrusion
the intrusion
the extrusion and the intrusion
When all of the atoms of an object are the same, that is called a(n)
element.
rock.
fossil.
extrusion.
The time it takes for half of the atoms in a radioactive rock to decay is its
element.
lifetime.
half-life.
radioactive life.
Carbon-14 is used to date
ancient rocks.
remains of living organisms.
any type of rock or fossil.
only fossils that are less than 1000 years ols.
An intrusion is
younger than the layers around it.
older than the layers around it.
the same age as the layers around it.
An extrusion is younger than
the layers below it.
the layers above it.
the same age as any nearby intrusions.
The youngest item in this picture is
E
D
B
A
