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8th Grade-Earth's History Unit
Test Description: Use these questions to review this unit.
Instructions: Answer all questions to get your test result.
1) The relative age of a rock
A
is an exact number
B
is based on carbon-14 daing
C
is less than the absolute age
D
compares the age to another
2) Younger rock layers on top and older on the bottom best describes
A
rock dating
B
relative age
C
law of superposition
D
absolute age
3) Fossils that were widely distributed but only live during a short period of time are
A
trace fossils
B
index fossils
C
petrified fossils
D
carbon fossils
4) The amount of time it takes for half of the radioactive atoms in a sample to decay is known as
A
full-life
B
half-life
C
relative age
D
absolute age
5) If you start with 200 atoms, how many remain after 2 half-lives?
A
50 atoms
B
25 atoms
C
100 atoms
D
200 atoms
6) Intrusions are
A
the same age as the layers around it
B
are the oldest
C
older than the layers around it
D
younger than the layers around it
7) Foot prints, burrows, and paw prints are an example of
A
migration fossils
B
trace fossils
C
superpostion
D
index fossils
8) If you ended up with 10 atoms after 3 half-lives, how many did you begin with?
A
80 atoms
B
10 atoms
C
30 atoms
D
1.25 atoms
9) If you started with 100 atoms and ended with 12.5 atoms, how many half-lives occured?
A
3
B
1
C
2
D
4
10) If you started with 500 atoms, how many do you have left after 1 half-life?
A
400 atoms
B
100 atoms
C
250 atoms
D
500 atoms
*select an answer for all questions
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