Question 1

How did an oxygen-rich atmosphere develop from a carbon dioxide-rich atmosphere?

Accepted Answer

A)  Through photosynthesis by cyanobacteria 
B)  Through volcanic eruptions 
C)  Through asteroid impacts 
A)  Through photosynthesis by cyanobacteria 
B)  Through volcanic eruptions 
C)  Through asteroid impacts

Question 2

Which of the following time periods were dinosaurs the dominant creatures?

Accepted Answer

A)  Cenozoic 
B)  Mesozoic 
C)  Paleozoic 
D)  Precambrian 
A)  Cenozoic 
B)  Mesozoic 
C)  Paleozoic 
D)  Precambrian

Question 3

What would fossil ages from the geologic timescale tell us about the age of this unconformity?

Accepted Answer

A)  The unconformity is younger than the fossil ages on the tilted bed. 
B)  The unconformity is older than the fossil ages in layers above the unconformity. 
C)  The amount of time represented by the unconformity can be approximately bracketed by the ages of the fossils above and below. 
D)  All of these. 
A)  The unconformity is younger than the fossil ages on the tilted bed. 
B)  The unconformity is older than the fossil ages in layers above the unconformity. 
C)  The amount of time represented by the unconformity can be approximately bracketed by the ages of the fossils above and below. 
D)  All of these.

Question 4

Which numbered layer in this photograph represents the oldest layer?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
A)  1 
B)  2 
C)  3 
D)  4

Question 5

How would we use isotopic ages to infer the ages of the upper and lower unit in this diagram?

Accepted Answer

A)  The lower unit would be younger than an age on the crosscutting dike. 
B)  The upper unit would be older than an age determined on pebbles of the dike in that unit. 
C)  The dike is younger than the lower unit but older than the upper unit. 
D)  An age on the dike would not help us because it is an igneous rock. 
A)  The lower unit would be younger than an age on the crosscutting dike. 
B)  The upper unit would be older than an age determined on pebbles of the dike in that unit. 
C)  The dike is younger than the lower unit but older than the upper unit. 
D)  An age on the dike would not help us because it is an igneous rock.

Question 6

Using the data in this table, determine the age of the granite unit G on this table).

Accepted Answer

A)  500 
B)  750 
C)  50,000,000 
D)  1,000,000,000 
E)  1,500,000,000 
A)  500 
B)  750 
C)  50,000,000 
D)  1,000,000,000 
E)  1,500,000,000

How did an oxygen-rich atmosphere develop from a carbon dioxide-rich atmosphere?

Which of the following time periods were dinosaurs the dominant creatures?

What would fossil ages from the geologic timescale tell us about the age of this unconformity?

Which numbered layer in this photograph represents the oldest layer?

How would we use isotopic ages to infer the ages of the upper and lower unit in this diagram?

Using the data in this table, determine the age of the granite unit G on this table).

The Nature of Geology

Investigating Geologic Questions

Plate Tectonics

Earth Materials

Igneous Environments

Volcanoes and Volcanic Hazards

Sedimentary Environments

Deformation and Metamorphism

Seafloor and Continental Margins

Mountains, Basins, and Continents

Earthquakes and Earths Interior

Climate and Weathering

Glaciers, Shorelines, and Changing Sea Levels

Weathering, Soil, and Unstable Slopes

Streams and Flooding

Water Resources

Energy and Mineral Resources

Geology of the Solar System

Filters

Exam 9: Geologic Time

How did an oxygen-rich atmosphere develop from a carbon dioxide-rich atmosphere?

Which of the following time periods were dinosaurs the dominant creatures?

What would fossil ages from the geologic timescale tell us about the age of this unconformity?

Which numbered layer in this photograph represents the oldest layer?

How would we use isotopic ages to infer the ages of the upper and lower unit in this diagram?

Using the data in this table, determine the age of the granite unit G on this table).

The Nature of Geology

Investigating Geologic Questions

Plate Tectonics

Earth Materials

Igneous Environments

Volcanoes and Volcanic Hazards

Sedimentary Environments

Deformation and Metamorphism

Seafloor and Continental Margins

Mountains, Basins, and Continents

Earthquakes and Earths Interior

Climate and Weathering

Glaciers, Shorelines, and Changing Sea Levels

Weathering, Soil, and Unstable Slopes

Streams and Flooding

Water Resources

Energy and Mineral Resources

Geology of the Solar System

Filters