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Earth's Age, Dating, and Trees

Total questions: 43

Worksheet time: 22mins

Name
Class
Date
1.
The Precambrian is the ___________ time span in Earth's history.
a)
youngest
b)
latest
c)
earliest
d)
middle
2.
Current scientific evidence shows that the Earth is estimated to be: 
a)
Less than 1 millions years old
b)
Between 3 and 4 billion years old
c)
More than 4 billions years old
d)
Less than 2 billion years old
3.

The Age of Mammals

a)

Cenozoic

b)

Mesozoic

c)

Paleozoic

4.

In which time period are we currently living?

a)

Precambrian Time

b)

Paleozoic Era

c)

Mesozoic Era

d)

Cenozoic Era

5.

What are the four eras in order from OLDEST to NEWEST?

a)

Pre-Cambrian, Paleozoic, Mesozoic, Cenozoic

b)

Pre-Cambrian, Mesozoic, Paleozoic, Cenozoic

c)

Cenozoic, Mesozoic, Paleozoic, Pre-Cambrian

d)

Mesozoic, Pre-Cambrian, Cenozoic, Paleozoic

6.

What era did trilobites, fishes, and other marine organisms dominate?

a)

Precambrian

b)

Paleozoic

c)

Mesozoic

d)

Cenozoic

7.

Which era is considered as the "Age of Reptiles"

a)

cenozoic

b)

mesozoic

c)

phanerozoic

d)

paleozoic

8.
What is the half-life of iodine-131?
a)
32 days
b)
8 days
c)
16 days
d)
24 days
9.

Method that enables scientists to determine the actual age of certain rocks and other objects. (examples include radiometric dating, ice core dating, tree ring dating and more)

a)

Absolute Age Dating

b)

Radiometric Dating

c)

Radioactive Decay

d)

Isotope

10.

The process of measuring the absolute age of geologic material by measuring the concentrations of radioactive isotopes and their decay products.

a)

Relative Age Dating

b)

Radiometric Dating

c)

Radioactive Decay

d)

Isotope

11.

The process in which a radioactive element breaks down into a stable isotope of another element.

a)

Absolute Age Dating

b)

Radiometric Dating

c)

Radioactive Decay

d)

Isotope

12.
Identify the Era:
First forms of life appeared in this era.
a)
Precambrian
b)
Paleozoic
c)
Mesozoic
d)
Cenozoic
13.
What era is sees the rise of mosses, ferns, and conifers?
a)
Precambrian 
b)
paleozoic
c)
Mesozoic 
d)
Cenzoic
14.
Mass extinction of the dinosaurs marks the end of this era.
a)
Mesozoic 
b)
Cambrian
c)
Jurassic 
d)
Cenozoic 
15.
Because of the extinction of dinosaurs this kingdom thrived.
a)
Reptiles
b)
mammals
c)
amphibians
d)
none of these
16.
Flowering plants dominate during this era.
a)
Cenozoic 
b)
Mesozoic 
c)
cambrian
17.
Era in which homosapiens appear.
a)
paleozoic
b)
mesozoic
c)
Triassic 
d)
cenozoic
18.
Popular theory suggests this ended the age of dinosaurs.
a)
asteroid impact
b)
ice age
c)
human predation
19.
Continents split into current positions.
a)
cenozoic
b)
paleozoic
c)
cambrian
d)
mesozoic
20.
One huge continent-Pangaea-forms.
a)
mesozoic
b)
cenozoic
c)
paleozoic
21.
Due to plant death in Paleozoic era, this forms.
a)
oil
b)
minerals
c)
coal
d)
rocks
22.
First plants appear
a)
Cenozoic
b)
Paleozic
c)
Mesozoic
d)
all of these
23.

What is the "Age of Mammals"

a)

Precambrian Eon

b)

Mesozoic Era

c)

Cenozoic Era

d)

Ice Age

24.

What was the "Age of Reptiles"

a)

Ice Age

b)

Mesozoic Era

c)

Precambrian Era

d)

Precambrian Eon

25.

What Eon represents 88% of Earth's history.

a)

Mesozoic

b)

Precambrian

c)

Paleozoic

d)

Cenozoic

26.

In what era did the "Trilobite" become the world's dominant species?

a)

Paleozoic

b)

Mesozoic

c)

Cenozoic

d)

Precambrian

27.
Pangaea broke up during the 
a)
Paleozoic
b)
Mesozoic
c)
Cenozoic
d)
Precambrian
28.
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
29.
The graph shows the radioactive decay of a 50-gram sample of a radioactive isotope. 
 According to the graph, what is the half-life of this isotope? 
a)
100 years
b)
150 years
c)
200 years
d)
300 years
30.
How far back in time can geologists study the history of the earth?
a)
1.6 billion years
b)
46 million years
c)
4.6 billion years
d)
160 billion years
31.
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
32.

Where did evidence that Earth is more than 4.5 billion years old come from?

a)

Moon rocks

b)

meteorites

c)

both moon rocks and meteorites

d)

ancient rocks in Canada

33.
What percent of carbon-14 would be left after 5730 years?
a)
100%
b)
75%
c)
50%
d)
25%
34.

Lower temperatures and drought conditions cause

a)

wide or thick rings

b)

thin rings

c)

oval rings

d)

perpendicular rings

35.

Warm temperatures and plenty of rainfall cause

a)

micro rings

b)

parallel rings

c)

wide rings

d)

thin rings

36.

People count tree rings to find out

a)

what kind of tree it is.

b)

the kind of soil the tree needs.

c)

the age of the tree.

d)

how long the tree will live.

37.

Thicker tree rings indicate poor growing conditions for plants and trees.

a)

True

b)

False

38.

What does dendrochronology do?

a)

Tell us how trees provide evidence about past climate

b)

Tell us how trees are made

c)

Tell us how trees predict the weather

39.

True/False: Tree ring growth varies throughout the year

a)

True

b)

False

40.

In which season do tree rings have more growth?

a)

winter

b)

late summer/fall

c)

all the time

d)

spring/early summer

41.

What is the pith?

a)

the last ring of the tree cookie

b)

the name of the bark

c)

a type of tree

d)

The very center and first tree ring in a tree cookie

42.

An annual growth ring (one year’s growth) is made up of what?

a)

3 dark rings together

b)

2 light rings together

c)

1 light and 1 dark ring together

43.

How old is this tree?

a)

20 years old

b)

10 years old

c)

12 years old

d)

17 years old

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