Question 1

Why is correlation needed to construct a complete geologic history of a region? How does correlation work,e.g. ,in the Colorado Plateau region?

Accepted Answer

No single location in a region has a geo

Question 2

The principle of original horizontality states that ____________________ rocks were deposited in horizontal layers.Thus,if rock layers are now ____________________,they must have been disturbed after lithification.

Accepted Answer

sedimentar

Question 3

Which of the following was not among the early scientific attempts to determine Earth's age?

Accepted Answer

A) the cooling rate of a molten iron sphere of Earth's diameter 
B) the rate of sediment deposition 
C) the rate at which water precipitation accumulated in the ocean 
D) the geologic principles and the inferred rates of change necessary to explain the fossil record 
E) the rate of salt accumulation in the ocean 
A) the cooling rate of a molten iron sphere of Earth's diameter 
B) the rate of sediment deposition 
C) the rate at which water precipitation accumulated in the ocean 
D) the geologic principles and the inferred rates of change necessary to explain the fossil record 
E) the rate of salt accumulation in the ocean

Question 4

What criteria are used to correlate rock units in different areas?

Accepted Answer

Similar lithology,si

Question 5

If an isotope has a half-life of 50 million years and an 1/8 of the sample remaining consists of that isotope,the age of the rock from which it was taken is:

Accepted Answer

A) 400 million years. 
B) 300 million years. 
C) 150 million years. 
D) 800 million years. 
E) none of the above 
A) 400 million years. 
B) 300 million years. 
C) 150 million years. 
D) 800 million years. 
E) none of the above

Question 6

Uranium 235 decays to lead 207 by 7 alpha and 6 beta steps.

Accepted Answer

A) True 
 B)False

Question 7

Fossils are found almost exclusively in sedimentary rocks.

Accepted Answer

A) True 
 B)False

Question 8

How are marker beds used to determine the age of strata in a region that has no marker beds but does contain strata with the same fossil assemblage zone?

Accepted Answer

Marker beds are dated with radiometric t

Question 9

How were absolute ages added to the geologic time scale in the 20ᵗʰ century?

Accepted Answer

Thousands of absolute ages were added to

Question 10

A body of rock that is intruded by another rock must be ____________________ in age than the intrusion.

Accepted Answer

The answer of A body of rock that is intruded...

Question 11

What do unconformities represent?

Accepted Answer

Unconformities represent missing time;th

Question 12

What sort of instrument is used to determine the parent-daughter ratio of isotopes,and what does it measure?

Accepted Answer

A mass spectrometer

Question 13

What fact makes radiocarbon dating possible?

Accepted Answer

Life forms stop accu

Question 14

Describe how the carbon-14 dating technique works.

Accepted Answer

Carbon 14 is constantly formed in the up

Question 15

What is absolute dating,and what is it based on? What can absolute dating tell us?

Accepted Answer

Absolute dating provides specific dates

Question 16

The Colorado Plateau has a record of geologic events occurring over about 2 billion years that was put together:

Accepted Answer

A) in a sequence found in the Grand Canyon. 
B) in a sequence from a drill core through the Plateau. 
C) by correlating the uppermost rocks in one area with the lowermost equivalent rocks in another area. 
D) in a sequence exposed in the Colorado Rockies. 
E) in a sequence spanning the entire United States. 
A) in a sequence found in the Grand Canyon. 
B) in a sequence from a drill core through the Plateau. 
C) by correlating the uppermost rocks in one area with the lowermost equivalent rocks in another area. 
D) in a sequence exposed in the Colorado Rockies. 
E) in a sequence spanning the entire United States.

Question 17

How was the geologic time scale developed in the 19ᵗʰ century?

Accepted Answer

Geologists applied relative-dating metho

Question 18

What are the requirements for a useful guide fossil?

Accepted Answer

A guide fossil should be easil

Question 19

Concurrent range zones are used in fossil correlation because most fossils:

Accepted Answer

A) have long geologic ranges. 
B) are very rare. 
C) are geographically restricted. 
D) are not common. 
E) are not well preserved. 
A) have long geologic ranges. 
B) are very rare. 
C) are geographically restricted. 
D) are not common. 
E) are not well preserved.

Question 20

The half-life of a radioactive element is the amount of time it takes for ____________________ of the atoms of the unstable ____________________ element to decay to atoms of a new,more stable ____________________ element.

Accepted Answer

half,paren

Why is correlation needed to construct a complete geologic history of a region? How does correlation work,e.g. ,in the Colorado Plateau region?

The principle of original horizontality states that rocks were deposited in horizontal layers.Thus,if rock layers are now ,they must have been disturbed after lithification.

Which of the following was not among the early scientific attempts to determine Earth's age?

What criteria are used to correlate rock units in different areas?

If an isotope has a half-life of 50 million years and an 1/8 of the sample remaining consists of that isotope,the age of the rock from which it was taken is:

Uranium 235 decays to lead 207 by 7 alpha and 6 beta steps.

Fossils are found almost exclusively in sedimentary rocks.

How are marker beds used to determine the age of strata in a region that has no marker beds but does contain strata with the same fossil assemblage zone?

How were absolute ages added to the geologic time scale in the 20ᵗʰ century?

A body of rock that is intruded by another rock must be ____________________ in age than the intrusion.

What do unconformities represent?

What sort of instrument is used to determine the parent-daughter ratio of isotopes,and what does it measure?

What fact makes radiocarbon dating possible?

Describe how the carbon-14 dating technique works.

What is absolute dating,and what is it based on? What can absolute dating tell us?

The Colorado Plateau has a record of geologic events occurring over about 2 billion years that was put together:

How was the geologic time scale developed in the 19ᵗʰ century?

What are the requirements for a useful guide fossil?

Concurrent range zones are used in fossil correlation because most fossils:

The half-life of a radioactive element is the amount of time it takes for of the atoms of the unstable element to decay to atoms of a new,more stable element.

Understanding Earth: A Dynamic and Evolving Planet

Plate Tectonics: A Unifying Theory

Minerals: The Building Blocks of Rocks

Igneous Rocks and Intrusive Igneous Activity

Volcanoes and Volcanism

Weathering, Soil, and Sedimentary Rocks

Metamorphism and Metamorphic Rocks

Earthquakes and Earths Interior

Deformation, Mountain Building, and the Continents

Mass Wasting

Running Water

Groundwater

Glaciers and Glaciation

The Work of Wind and Deserts

Oceans, Shorelines, and Shoreline Processes

Earth History

Life History

Filters

Exam 16: Geologic Time: Concepts and Principles

Why is correlation needed to construct a complete geologic history of a region? How does correlation work,e.g. ,in the Colorado Plateau region?

The principle of original horizontality states that ____________________ rocks were deposited in horizontal layers.Thus,if rock layers are now ____________________,they must have been disturbed after lithification.

Which of the following was not among the early scientific attempts to determine Earth's age?

What criteria are used to correlate rock units in different areas?

If an isotope has a half-life of 50 million years and an 1/8 of the sample remaining consists of that isotope,the age of the rock from which it was taken is:

Uranium 235 decays to lead 207 by 7 alpha and 6 beta steps.

Fossils are found almost exclusively in sedimentary rocks.

How are marker beds used to determine the age of strata in a region that has no marker beds but does contain strata with the same fossil assemblage zone?

How were absolute ages added to the geologic time scale in the 20ᵗʰ century?

A body of rock that is intruded by another rock must be ____________________ in age than the intrusion.

What do unconformities represent?

What sort of instrument is used to determine the parent-daughter ratio of isotopes,and what does it measure?

What fact makes radiocarbon dating possible?

Describe how the carbon-14 dating technique works.

What is absolute dating,and what is it based on? What can absolute dating tell us?

The Colorado Plateau has a record of geologic events occurring over about 2 billion years that was put together:

How was the geologic time scale developed in the 19ᵗʰ century?

What are the requirements for a useful guide fossil?

Concurrent range zones are used in fossil correlation because most fossils:

The half-life of a radioactive element is the amount of time it takes for ____________________ of the atoms of the unstable ____________________ element to decay to atoms of a new,more stable ____________________ element.

Understanding Earth: A Dynamic and Evolving Planet

Plate Tectonics: A Unifying Theory

Minerals: The Building Blocks of Rocks

Igneous Rocks and Intrusive Igneous Activity

Volcanoes and Volcanism

Weathering, Soil, and Sedimentary Rocks

Metamorphism and Metamorphic Rocks

Earthquakes and Earths Interior

Deformation, Mountain Building, and the Continents

Mass Wasting

Running Water

Groundwater

Glaciers and Glaciation

The Work of Wind and Deserts

Oceans, Shorelines, and Shoreline Processes

Earth History

Life History

Filters

The principle of original horizontality states that rocks were deposited in horizontal layers.Thus,if rock layers are now ,they must have been disturbed after lithification.

The half-life of a radioactive element is the amount of time it takes for of the atoms of the unstable element to decay to atoms of a new,more stable element.