Worksheets5 - Earth History #2
Total questions: 30
Worksheet time: 21mins
Name
Class
Date
1.
If an index fossil is found in two rock layers that are separated by an ocean, what do you know about the relationship between the two rock layers?
a)
they are about the same age
b)
both areas were dry
c)
the are made of the same kind of rock
d)
the rock layers are unrelated
2.
Which type of dating method can be used on rock layers by applying the Law of Superposition?
a)
relative dating
b)
absolute dating
c)
radioactive dating
d)
radiometric dating
3.
Gaps in rock layers caused by erosion are called.
a)
law of superposition
b)
unconformities
c)
uniformitarianism
d)
relative dating
4.
What things make a good index fossil?
a)
Good looks and a great smile
b)
widespread and on Earth of a short time
c)
widespread and on Earth for a long time
d)
Only found in one location and in every layer
5.
Which of the following is the oldest?
a)
Layer L
b)
Intrusion D
c)
Intrusion H
d)
Layer E
6.
Which of the following correctly lists the layers in order from oldest to youngest?
a)
A, B, C, D, E
b)
E, B, C, D, A
c)
E, D, C, B, A
d)
C, B, A, D, E
7.
Which best describes radiometric dating?
a)
using instruments that detect radioactivity to figure out how old something is
b)
measuring the relative amounts of a radioactive isotope and a daughter product to figure out the age of a sample
c)
measuring how quickly the different radioactive isotopes in a sample decay to figure out the age of the sample
d)
using short-wavelength electromagnetic radiation to determine the age of a sample
8.
The length of time required for half of the radioactive atoms in a sample to decay is its...
a)
era
b)
age
c)
half-life
d)
eon
9.
Scientists use radioactive decay to measure...
a)
relative time
b)
absolute time
c)
half-lives
d)
time of day
10.
Which element is usually used to date rocks?
a)
Carbon-14
b)
Nitrogen-12
c)
Uranium-238
d)
Oxygen-18
11.
How old do Paleontologists believe the Earth is?
a)
2015 years old
b)
3.6 billion years old
c)
4.6 billion years old
d)
4.6 million years old
12.
What happens during radioactive decay?
a)
A stable isotope of one element changes into an unstable isotope of a different element
b)
A stable isotope of one element changes into an unstable isotope of the same element
c)
An unstable isotope of one element changes into a stable isotope of a different element
d)
An unstable isotope of one element changes into a stable isotope of the same element
13.
Which is more stable?
a)
parent isotope
b)
daughter isotope
14.
How many half lives have taken place after 50% of the parent isotope is remaining?
a)
1
b)
2
c)
3
d)
4
15.
How much of the parent isotope is remaining after 3 half lives?
a)
50%
b)
25%
c)
12.5%
d)
100%
16.
What geological feature is being shown?
a)
fault with folding
b)
contact metamorphism
c)
nonconformity
d)
angular unconformity
17.
In the diagram there are 4 outcrops or 4 different locations for rock layers shown. Fossils are found at all 4 locations. Looking at the diagrams, which letter (A, B, C, or D) most likely represents an index fossil?
a)
A
b)
B
c)
C
d)
D
18.
Which of the following is an example of a trace fossil?
a)
A skeleton preserved in a tar pit
b)
A footprint of an extinct animal
c)
A mummy buried in ice
d)
An insect preserved in amber
19.
Although a cast fossil looks like an original bone or shell, how is it different?
a)
It's made of rock
b)
It contains skin, hair, and other remnants
c)
It has been liquefied
d)
It is completely colorless
20.
What is a mold fossil
a)
Clay
b)
Nasty old moldy dinosaur bones
c)
A hallow area left in sediment in the shape of an organism
d)
All of the above
21.
What is a Fossil?
a)
A Bone
b)
Nasty
c)
the preserved remains or traces of animals, plants, and other organisms from the remote past
d)
The Bone of a dead thing
22.
What type of fossil is this?
a)
Trace fossil
b)
Mold
c)
Cast
d)
Carbon film
23.
What type of fossil is this?
a)
Mold
b)
Cast
c)
Preserved remains
d)
Trace fossil
24.
Which statement is true about the fossil record?
a)
It is a record of all living things
b)
It shows how our climate has remained the same over time
c)
It provides evidence for history of life on Earth
d)
It does not support the theory of evolution
25.
Fossils are usually found in
a)
igneous rock
b)
extrusions
c)
intrusions
d)
sedimentary rock
26.
The original element that undergoes radioactive decay is known as the...
a)
daughter element
b)
half-life
c)
parent element
d)
carbon-14
27.
Why are isotopes with short half-lives not useful for dating very old rocks?
a)
because not enough of the parent isotope remains to measure accurately
b)
because not enough of the daughter product has formed to be detectable
c)
because neither the parent isotope nor the daughter product will be detectable
d)
because very old rocks would never have contained these isotopes
28.
If a sample contains 100 g of a radioactive isotope, how much will be left after 3 half lives?
a)
50 grams
b)
75 grams
c)
25 grams
d)
12.5 grams
29.
If a sample contains 20g of an isotope that has a half life of 1000 years. How much will be left after 2000years?
a)
10 grams
b)
5 grams
c)
15 grams
d)
2.5 grams
30.
Information:
Uranium - 238 has a half life of 4.5 billion years
Questions:
1. If you start with 1000 g of Uranium - 238, how much will remain after 4 half lives?
2. How much time will have passed after 4 half lives?
Uranium - 238 has a half life of 4.5 billion years
Questions:
1. If you start with 1000 g of Uranium - 238, how much will remain after 4 half lives?
2. How much time will have passed after 4 half lives?
a)
500 grams/ 9 billion years
b)
250 grams/ 13.5 billion years
c)
62.5 grams/ 18 billion years
d)
125 grams/ 18 billion years
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