Question 1

Assume that human recorded history can be stretched back to 4600 years before the present.This is approximately what fraction of geologic time?

Accepted Answer

A) one ten-thousandth 
B) one millionth 
C) one billionth 
D) one hundred-thousandth 
A) one ten-thousandth 
B) one millionth 
C) one billionth 
D) one hundred-thousandth

Question 2

An unconformity is ________.

Accepted Answer

A) an erosional (or non-depositional)surface with younger strata above and older rocks below 
B) the lower contact of an intrusive sill with sedimentary strata 
C) a fault with younger, sedimentary rocks above and older, igneous rocks below 
D) the contact between a cross-cutting pluton and sedimentary rocks 
A) an erosional (or non-depositional)surface with younger strata above and older rocks below 
B) the lower contact of an intrusive sill with sedimentary strata 
C) a fault with younger, sedimentary rocks above and older, igneous rocks below 
D) the contact between a cross-cutting pluton and sedimentary rocks

Question 3

High concentrations of what rare mantle- or meteorite-derived element occur in sediments that span the K/T boundary?

Accepted Answer

The answer of High concentrations of what rare mantle- or...

Question 4

Which geologic eon denotes the first 800 million years of Earth history?

Accepted Answer

A) Chaldean 
B) Proterozoic 
C) Hadean 
D) Archean 
A) Chaldean 
B) Proterozoic 
C) Hadean 
D) Archean

Question 5

The ratio of parent to daughter isotopes in a radioactive decay process is 0.40.How many half-lives have elapsed since the material was 100% parent atoms?

Accepted Answer

A) 1-2 
B) 3 
D) 2-3 
A) 1-2 
B) 3 
D) 2-3

Question 6

What kind of unconformity is produced when tilted, older strata are eroded, then buried by younger strata?

Accepted Answer

angular un

Question 7

What is the useful range of ages that can be determined using the C-14 dating method?

Accepted Answer

a few hundred years

Question 8

The name of which geologic era means "ancient life"?

Accepted Answer

A) Phanerozoic 
B) Proterozic 
C) Paleozoic 
D) "Geezer-cene" 
A) Phanerozoic 
B) Proterozic 
C) Paleozoic 
D) "Geezer-cene"

Question 9

How can radiometric dating yield reliable values for the ages of minerals, rocks and some fossils?

Accepted Answer

A) The decay constants are fixed and well measured for isotopic decay. 
B) One only needs to analyse for the parent isotope. 
C) The physical conditions that control decay, like temperature and pressure, are always well known. 
D) There are absolute fossil ages to compare to and test the radiometric clocks. 
A) The decay constants are fixed and well measured for isotopic decay. 
B) One only needs to analyse for the parent isotope. 
C) The physical conditions that control decay, like temperature and pressure, are always well known. 
D) There are absolute fossil ages to compare to and test the radiometric clocks.

Question 10

Compared to the initial amount of U-238 present when the Earth, moon or meteorites formed, how much remains at the present time (fraction or %).

Accepted Answer

one half, 50% becaus

Question 11

What gas is a radioactive daughter product of the U-238 decay series?

Accepted Answer

A) xenon-143 
B) carbon-14 
C) radon-226 
D) argon-40 
A) xenon-143 
B) carbon-14 
C) radon-226 
D) argon-40

Question 12

The oldest Earth rocks that have been radiometrically dated are Early Archean.

Accepted Answer

A) True 
 B)False

Question 13

Which of the following denotes the investigative process by which geologists identify and match sedimentary strata and other rocks of the same ages in different areas?

Accepted Answer

A) strata typing 
B) cross-cutting 
C) radioactive intuition 
D) correlation 
A) strata typing 
B) cross-cutting 
C) radioactive intuition 
D) correlation

Question 14

What kind of date yields numbers in years?

Accepted Answer

The answer of What kind of date yields numbers in...

Question 15

What is the noble-gas, daughter product of the radioactive isotope, K-40?

Accepted Answer

The answer of What is the noble-gas, daughter product of...

Question 16

The Phanerozoic Eon comprises approximately the ________ of geologic time.

Accepted Answer

A) last 15% 
B) first 85% 
C) last 85% 
D) first 15% 
A) last 15% 
B) first 85% 
C) last 85% 
D) first 15%

Question 17

Which of the following statements is true, concerning sedimentary strata separated by a disconformity?

Accepted Answer

A) The younger strata were tilted after the older strata were. 
B) All strata exhibit parallel bedding or stratification, but there is a hiatus (missing record). 
C) The older strata were tilted when the younger strata were deposited. 
D) All of the older strata were eroded away before the younger strata were tilted. 
A) The younger strata were tilted after the older strata were. 
B) All strata exhibit parallel bedding or stratification, but there is a hiatus (missing record). 
C) The older strata were tilted when the younger strata were deposited. 
D) All of the older strata were eroded away before the younger strata were tilted.

Question 18

Which type of unconformity has flat sedimentary rocks resting on older igneous or metamorphic rocks?

Accepted Answer

The answer of Which type of unconformity has flat sedimentary...

Question 19

________ is an erosional contact between tilted, older strata below and horizontal, younger strata above.

Accepted Answer

A) An angular deformity 
B) An angular unconformity 
C) A disconformity 
D) A cross-cutting fault 
A) An angular deformity 
B) An angular unconformity 
C) A disconformity 
D) A cross-cutting fault

Question 20

The Phanerozoic and Proterozoic eons were both about 2.3 billion years long.

Accepted Answer

A) True 
 B)False

Assume that human recorded history can be stretched back to 4600 years before the present.This is approximately what fraction of geologic time?

An unconformity is ________.

High concentrations of what rare mantle- or meteorite-derived element occur in sediments that span the K/T boundary?

Which geologic eon denotes the first 800 million years of Earth history?

The ratio of parent to daughter isotopes in a radioactive decay process is 0.40.How many half-lives have elapsed since the material was 100% parent atoms?

What kind of unconformity is produced when tilted, older strata are eroded, then buried by younger strata?

What is the useful range of ages that can be determined using the C-14 dating method?

The name of which geologic era means "ancient life"?

How can radiometric dating yield reliable values for the ages of minerals, rocks and some fossils?

Compared to the initial amount of U-238 present when the Earth, moon or meteorites formed, how much remains at the present time (fraction or %).

What gas is a radioactive daughter product of the U-238 decay series?

The oldest Earth rocks that have been radiometrically dated are Early Archean.

Which of the following denotes the investigative process by which geologists identify and match sedimentary strata and other rocks of the same ages in different areas?

What kind of date yields numbers in years?

What is the noble-gas, daughter product of the radioactive isotope, K-40?

The Phanerozoic Eon comprises approximately the ________ of geologic time.

Which of the following statements is true, concerning sedimentary strata separated by a disconformity?

Which type of unconformity has flat sedimentary rocks resting on older igneous or metamorphic rocks?

________ is an erosional contact between tilted, older strata below and horizontal, younger strata above.

The Phanerozoic and Proterozoic eons were both about 2.3 billion years long.

An Introduction to Geology and Plate Tectonics

Minerals: The Building Blocks of Rocks

Igneous Rocks

Volcanoes and Volcanic Processes

Weathering and Soil

Sedimentary Rocks

Metamorphism and Metamorphic Rocks

Crustal Deformation

Earthquakes and Earth's Interior

The Ocean Floor

Plate Tectonics: The Framework for Modern Geology

Mountain Building and Continental Frameworks

Mass Wasting: The Work of Gravity

Running Water

Groundwater

Glaciers and Glaciation

Deserts and Winds

Shorelines

Mineral and Energy Resources

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Exam 8: Geologic Time

Assume that human recorded history can be stretched back to 4600 years before the present.This is approximately what fraction of geologic time?

An unconformity is ________.

High concentrations of what rare mantle- or meteorite-derived element occur in sediments that span the K/T boundary?

Which geologic eon denotes the first 800 million years of Earth history?

The ratio of parent to daughter isotopes in a radioactive decay process is 0.40.How many half-lives have elapsed since the material was 100% parent atoms?

What kind of unconformity is produced when tilted, older strata are eroded, then buried by younger strata?

What is the useful range of ages that can be determined using the C-14 dating method?

The name of which geologic era means "ancient life"?

How can radiometric dating yield reliable values for the ages of minerals, rocks and some fossils?

Compared to the initial amount of U-238 present when the Earth, moon or meteorites formed, how much remains at the present time (fraction or %).

What gas is a radioactive daughter product of the U-238 decay series?

The oldest Earth rocks that have been radiometrically dated are Early Archean.

Which of the following denotes the investigative process by which geologists identify and match sedimentary strata and other rocks of the same ages in different areas?

What kind of date yields numbers in years?

What is the noble-gas, daughter product of the radioactive isotope, K-40?

The Phanerozoic Eon comprises approximately the ________ of geologic time.

Which of the following statements is true, concerning sedimentary strata separated by a disconformity?

Which type of unconformity has flat sedimentary rocks resting on older igneous or metamorphic rocks?

________ is an erosional contact between tilted, older strata below and horizontal, younger strata above.

The Phanerozoic and Proterozoic eons were both about 2.3 billion years long.

An Introduction to Geology and Plate Tectonics

Minerals: The Building Blocks of Rocks

Igneous Rocks

Volcanoes and Volcanic Processes

Weathering and Soil

Sedimentary Rocks

Metamorphism and Metamorphic Rocks

Crustal Deformation

Earthquakes and Earth's Interior

The Ocean Floor

Plate Tectonics: The Framework for Modern Geology

Mountain Building and Continental Frameworks

Mass Wasting: The Work of Gravity

Running Water

Groundwater

Glaciers and Glaciation

Deserts and Winds

Shorelines

Mineral and Energy Resources

Filters