AnswersDRHS GA-GSE Earth SystemsUnit Test

Unit Test — Unit test Answers

0 verified answers
1
Free Preview

The image shows flat sedimentary rock layers in the foreground and angled sedimentary rock layers in the background.

Question illustration
A
They cracked at an angle.
B
They were deposited at an angle.
C
They were deposited vertically and then shifted by a geologic event.
D
They were deposited horizontally and then shifted by a geologic event.
2
Free Preview

The image shows cross-cutting relationships. B, W, E, and K represent rock layers, and Q represents a fault.

Question illustration
A
Layer K is the oldest.
B
Layer W is the youngest.
C
Fault Q occurred before layer K was deposited.
D
Layers B, W, and E were deposited after fault Q occurred.
3

Which correctly lists the three isotopes that geologists measure to determine the age of an organism’s remains?

A
argon, nitrogen, and carbon-12
B
carbon-14, nitrogen, and carbon-12
C
nitrogen, potassium, and carbon-14
D
carbon-12, potassium, and argon
4

Which information can be determined using half-life?

A
age of material
B
type of particle released
C
percentage of rock that has aged
D
number of radioactive particles left
5

Which is one piece of information that fossils in samples from Earth’s crust reveal about Earth’s history?

A
changes in climate
B
number of species at a specific time
C
composition of Earth’s core
D
age of organisms when they died
6

Which evidence suggests that several mass extinctions have occurred during Earth's history?

A
Fossils provide information about water level and temperature.
B
Many fossils demonstrate that organisms have changed over time.
C
Fossils of the same species have been found on distant continents.
D
Many fossils of organisms that are no longer living have been discovered.
7

Error

Answer not available
8

Which best explains a primary reason for the inability of life to exist in Earth’s early atmosphere?

A
There was insufficient energy from material collisions to change their density.
B
High temperatures during Precambrian time caused surface water evaporation.
C
Volcanic eruptions and comet collisions added different gases to the atmosphere.
D
Available oxygen was used to help create an ozone layer within Earth’s atmosphere.
9

Which phrase describes the relative age of a rock?

A
uses the law of superposition to determine which rock is older or younger
B
can determine the age based on location of a rock within the same layer
C
requires only one rock to determine the age
D
can provide the exact age of a rock
10

Study the diagram of the geologic time scale.Which method is most likely used to identify what happened before the start of the Paleozoic era?

Question illustration
A
Scientists study fossils from the Jurassic period.
B
Scientists observe index fossil records of the Mesozoic era.
C
Scientists examine fossil evidence during the Precambrian time.
D
Scientists explore the emergence of mammals and humans in the Cenozoic era.
11

Error

Answer not available
12

For which object would a geologist use carbon-14 dating to determine age?

A
The bones of animals
B
Rocks older than 50,000 years old
C
Types of Sedimentary rocks
D
Parts of Volcanic rock
13

Which is the first step in the process during the formation of molded fossils?

A
Sediment hardens into rock.
B
Sediment is eroded from rock.
C
Organisms are buried under sediment.
D
Organisms' shapes are preserved in rock.
14

After two half-lives, how much of the original material has decayed?

A
25 percent
B
50 percent
C
75 percent
D
100 percent
15

How might an entire insect be preserved?

A
Soft and hard tissues turn the insect into rock.
B
Tree sap flows over the insect and hardens.
C
Sediment accumulates over the insect and hardens.
D
Carbon from the decaying insect leaves a print on a rock.
16

A scientist finds a fossil that she thinks might make a good index fossil.Which characteristic does this fossil most likely have?

A
It is the remains of an organism still found alive today.
B
It is the remains of an organism that is found in abundance nearby.
C
It is the only fossil for this type of organism that has ever been found.
D
It is the remains of an organism that lived in a narrow geographic area.
17

Study the image.8307-06-05-10.jpg

Question illustration
A
Mosses appeared after the first flowering plants.
B
Aquatic Flora appeared many years ago.
C
The first flowering plants appeared around 240 million years ago.
D
The first flowering plants were introduced toward the end of the Mesozoic era.
18

Which property of argon makes it useful for potassium-argon dating?

A
It decays into potassium.
B
It is an unstable element.
C
It remains trapped in rock.
D
It is useful only for dating newer rock.
19

Which phrase describes the absolute age of a rock?

A
does not provide an exact age
B
is the number of years since it formed
C
is the age compared to other rocks around it
D
indicates whether it is younger or older than the rocks above it
20

The table shows index fossils.

Question illustration
A
Life forms existed during the Cambrian period.
B
Similar fossil species formed after the Devonian period.
C
This fossil species first appeared during the Cenozoic era.
D
Different life forms were surviving during Precambrian time.

Did you find these answers helpful?