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The Relative Age Of Rocks
Test Description: These are practice questions on the relative age of rocks.
Instructions: Answer all questions to get your test result.
1) The relative age of a rock is
A
its age compared to the ages of other rocks.
B
its age based on how much carbon-14 the rock contains.
C
less than the age of the fossils the rock contains.
D
the number of years since the rock formed.
2) The law of superposition states that, in horizontal layers of sedimentary rock, each layer is i
A
older than the layer above it and younger than the layer below it.
B
always older than any vertical layers.
C
a younger than the layer above it and older than the layer below it.
D
neither older nor younger than the other layers.
3) What is the age of an intrusion of igneous rock in relation to the sedimentary rock layers through which it passes?
A
always younger
B
sometimes younger, sometimes older
C
the same age as the other rock layers
D
always older
4) A rock layer's ___________ age is its age compared to the ages of other rock layers.
A
apparent
B
absolute
C
temporary
D
relative
5) A(n) ___________ is a gap in the geologic record where some rock layers have been lost because of erosion.
A
conformity
B
opportunity
C
unconformity
D
uniformity
6) The _________ age of a rock is the number of years since the rock formed.
A
temporary
B
absolute
C
apparent
D
relative
7) Lava that hardens on a surface is called an
A
extrusion
B
absolution
C
unconformity
D
intrusion
8) An _________ is when the magma cools and hardens into a mass of igneous rock.
A
uncomformity
B
absolution
C
intrusion
D
extrusion
9) A(n) _________ fossil is a fossil that must be widely distributed and represent a type of organism that existed only briefly.
A
intrusive
B
relative
C
index
D
unconformity
10) Index fossils are useful because they tell the ______________ __________ of the rock layers in which they occur.
A
apparent age
B
relative age
C
absolute age
D
temporary age
11) The study of rock layers is called
A
fossil record
B
rock strata
C
stratigraphy
D
intrusion
12) A break in the Earth's crust caused by forces inside the Earth is called a(n)
A
fault
B
intrusion
C
extrusion
D
unconformity
*select an answer for all questions
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