Question 1

The earliest modern human fossils are about __________ years old.

Accepted Answer

A)  100,000
B)  150,000
C)  200,000
D)  250,000E) A) and B)
F) A) and C)

Question 2

-Which layer in the figure has the lowest density?

Accepted Answer

A)  the lithosphere
B)  the lower mantle
C)  the outer core
D)  the inner coreE) None of the above
F) All of the above

Question 3

The crust is the outermost portion of Earth's layers.

Accepted Answer

A) True 
 B)False

Question 4

Most of Earth's biological history consists of single-celled bacteria.

Accepted Answer

A) True 
 B)False

Question 5

Earth is one of __________ planets in the solar system.

Accepted Answer

A)  seven
B)  eight
C)  nine
D)  tenE) A) and B)
F) B) and C)

Question 6

The mantle lies at a depth of __________ kilometers.

Accepted Answer

A)  35 to 2,900
B)  70 to 2,900
C)  100 to 2,900
D)  200 to 2,900E) B) and D)
F) A) and D)

Question 7

The Anthropocene marks the beginning of farming.

Accepted Answer

A) True 
 B)False

Question 8

How did Earth's atmosphere form?

Accepted Answer

A)  from volcanic gases
B)  from early plants
C)  from comets and asteroids
D)  from chemical reactionsE) A) and B)
F) All of the above

Question 9

Which statement does not describe the Willamette meteorite that was found in Oregon?

Accepted Answer

A)  It is the largest meteorite ever found in the United States.
B)  It is composed mostly of iron.
C)  It is over a billion years old.
D)  It weighs 300 tonsE) B) and D)
F) All of the above

Question 10

Scientists think the universe is about __________ billion years old.

Accepted Answer

A)  6
B)  10.2
C)  13.8
D)  15E) None of the above
F) A) and B)

Question 11

There have been about __________ mass extinction events in Earth's history.

Accepted Answer

A)  two
B)  three
C)  four
D)  fiveE) A) and D)
F) B) and C)

Question 12

The thickness of the crust is __________ percent of the radius of the planet.

Accepted Answer

A)  0.01 to 1
B)  1 to 2
C)  2 to 5
D)  5 to 10E) All of the above
F) A) and C)

Question 13

Light travels at __________ kilometers per second.

Accepted Answer

A)  1,000
B)  100,000
C)  300,000
D)  500,000E) All of the above
F) None of the above

Question 14

Oxygen concentrations in the atmosphere first began rising about __________ billion years ago.

Accepted Answer

A)  1.5
B)  2.4
C)  3.1
D)  3.6E) All of the above
F) A) and B)

Question 15

Earth's human population is currently just over 7 billion.

Accepted Answer

A) True 
 B)False

Question 16

What is a stromatolite?

Accepted Answer

A)  a region in the French Alps
B)  a region of Earth's interior
C)  an instrument used to measure rock chemistry
D)  a mat of photosynthetic bacteriaE) B) and D)
F) A) and B)

Question 17

Most of what is known about the physical structure of Earth's deep interior comes from __________.

Accepted Answer

A)  deep drill core samples
B)  lava samples from volcanoes
C)  computer modeling
D)  seismic wavesE) B) and D)
F) All of the above

Question 18

The core of the planet is nearly __________ degrees Celsius.

Accepted Answer

A)  4,000
B)  4,500
C)  5,000
D)  5,500E) None of the above
F) A) and C)

Question 19

The oldest rocks on Earth are dated using radiocarbon dating.

Accepted Answer

A) True 
 B)False

Question 20

About 10% of all mammal biomass is people and domesticated animals.

Accepted Answer

A) True 
 B)False

Exam 12: Earth History, Earth Interior

The mantle lies at a depth of __________ kilometers.

Correct AnswerverifiedShow Answer

Oxygen concentrations in the atmosphere first began rising about __________ billion years ago.

Correct AnswerverifiedShow Answer

Light travels at __________ kilometers per second.

Correct AnswerverifiedShow Answer

About 10% of all mammal biomass is people and domesticated animals.

Correct AnswerverifiedShow Answer

Scientists think the universe is about __________ billion years old.

Correct AnswerverifiedShow Answer

-Which layer in the figure has the lowest density?

Correct AnswerverifiedShow Answer

The Anthropocene marks the beginning of farming.

Correct AnswerverifiedShow Answer

The earliest modern human fossils are about __________ years old.

Correct AnswerverifiedShow Answer

Most of what is known about the physical structure of Earth's deep interior comes from __________.

Correct AnswerverifiedShow Answer

How did Earth's atmosphere form?

Correct AnswerverifiedShow Answer

What is a stromatolite?

Correct AnswerverifiedShow Answer

The core of the planet is nearly __________ degrees Celsius.

Correct AnswerverifiedShow Answer

Earth is one of __________ planets in the solar system.

Correct AnswerverifiedShow Answer

There have been about __________ mass extinction events in Earth's history.

Correct AnswerverifiedShow Answer

Earth's human population is currently just over 7 billion.

Correct AnswerverifiedShow Answer

Which statement does not describe the Willamette meteorite that was found in Oregon?

Correct AnswerverifiedShow Answer

The crust is the outermost portion of Earth's layers.

Correct AnswerverifiedShow Answer

The oldest rocks on Earth are dated using radiocarbon dating.

Correct AnswerverifiedShow Answer

Most of Earth's biological history consists of single-celled bacteria.

Correct AnswerverifiedShow Answer

The thickness of the crust is __________ percent of the radius of the planet.

Correct AnswerverifiedShow Answer

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