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