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Absolute And Relative Age Dating
Test Description: Absolute and Relative Age Dating
Instructions: Answer all questions to get your test result.
1) Which of these is the best indication of the relative age of a rock layer?
A
The distance of the layer extends over the Earth
B
The chemical make-up of the layer
C
The thickness of the layer
D
The position of the layer compared to other layers
2) Why is the "Law of Superposition" critical to the study of fossil life forms?
A
It allows us to time-sequence fossils
B
It states that heavier rocks are on the bottom and light rocks rise to the top.
C
It tells us that organisms are usually replaced by more highly-adapted ones.
D
It specifies that each layer of rock is a different type of mineral.
3) Rock layers tell a story about their past. What is the basic assumption that is made when reading the story?
A
The Earth\'s crust cooled and them remelted before the rock layers began to form
B
The processes in the rock cycle were the same in the past as they are today
C
The composition of the Earth\'s atmosphere has been constant
D
Chemical reactions in the past were slower than they are today
4) In an undisturbed rock profile, the oldest rocks are found
A
on the bottom
B
anywhere
C
in the middle
D
on the top
5) A fossil shell contain 25% of the original amount of its carbon-14. Approximately how many years ago was this shell part of a living organism?
A
5,700 years ago
B
22,800 years ago
C
11,400 years ago
D
17,100 years ago
6) Which statement can best be supported by the fossil record?
A
Most life-forms that existed on Earth have become extinct.
B
The organisms on Earth have not changed.
C
Humans have lived on Earth throughout geological history.
D
Dinosaurs existed on Earth for more than 544 million years.
7) The absolute age of a rock is the approximate number of years ago that the rock formed. The absolute age of an igneous rock can best be determined by
A
comparing the amounts of decayed and undecayed radioactive isotopes in the rock
B
comparing the sizes of the crystals found in the upper and lower parts of the rock
C
examining the rock's relative position in a rock outcrop
D
examining the environment in which the rock is found
8) Which radioactive substance has the longest half-life?
A
Rubidium-87
B
Potassium-40
C
Uranium-238
D
Carbon-14
9) Which radioactive isotope would be used to determine the age of a wooly mammoth found in Pleistocene sediments?
A
Rubidium-87
B
Potassium -40
C
Carbon-14
D
Uranium-238
10) One similarity between Carbon-14 and Uranium 238 is that both
A
are found in granite
B
have the same half-life
C
decay at a predictable rate
D
are normally found in large quantities in living matter
*select an answer for all questions
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