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ABSOLUTE vs RELATIVE Age of Rocks Flashcards | StudBud
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ABSOLUTE vs RELATIVE Age of Rocks
ABSOLUTE vs RELATIVE Age of Rocks
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Earth Science
Flashcards
18 cards
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Questions
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Answers
1
Knowing whether a rock is older or younger is known as
Relative age
Radioactive decay
Absolute age
Half-life
2
The layer labeled YOUNGEST is an example of
a hardened lava flow
an igneous intrusion
a sedimentary rock layer
an extrusion
3
After 3 half-lives, how much of the original radioactive element is left?
6.5%
25%
12.5%
50%
4
Some elements are radioactive which means ______________
they are always the same and never change
they give off energy as they break down
5
Absolute age
the actual age of rocks
the age of rocks related to each other
the time since a rock weathered
the time since a rock eroded
6
Geologists use RADIOACTIVE DATING to determine the RELATIVE AGE of rocks.
FALSE
There is no way to know how old rocks are
TRUE
7
A break or crack along which rocks move
break
crack
fault
gorge
8
A half-life is:
Time it takes 50% of a radioactive element to heat up.
Time it takes 50% of a radioactive element to grow.
Time it takes 50% of a radioactive element to implode.
Time it takes 50% of a radioactive element to decay.
9
A hardened layer of magma (inside the Earth)
extrusion
intrusive
extrusive
intrustion
10
The amount of time it takes for material that was radioactive to decay into a more stable form
Half-life
Absolute age
Relative age
11
When all of the atoms of a particular type of matter are the same they are called an ELEMENT.
Cannot be calculated
FALSE
TRUE
12
Is the Hermit Shale OLDER or YOUNGER than the Coconino Sandstone?
Older
1 million years older
Younger
13
All matter is composed of tiny particles called
sand
grit
atoms
particles
14
Rocks or fossils found in the LOWEST layers are ___________ than those in the top layers
more common
older
the same age
younger
15
Extrusion
hmmmmm magma or lava?????
a hardened layer of magma
a hardened layer of lava
I know, lava, NO magma
16
Relative age
the actual age of rocks
the age of rocks compared to other rocks
the age of new rocks
the age of rocks compared to other isotopes
17
What is an index fossil?
Fossil used to date layers of rock
fossil from plants
fossil in the back of a book
fossils from animals
18
What is it called when one atoms of one element change into a more stable element?
decay
half-life
reformation
deformation
