Question 1

A sedimentary rock that shows evidence of contact metamorphism must be ____________________ in age than the igneous rock with which it is in contact,even if it lies above the igneous rock.

Accepted Answer

The answer of A sedimentary rock that shows evidence of...

Question 2

An interval of geologic time not represented by strata in a particular area is a(n)____________________.

Accepted Answer

The answer of An interval of geologic time not represented...

Question 3

In order to correlate age-equivalent rock units of dissimilar composition or to correlate rock units over a large area,____________________ and the principle of ____________________ must be used.

Accepted Answer

The answer of In order to correlate age-equivalent rock units...

Question 4

The time necessary for half of the atoms of the unstable parent element to decay to the new,more stable daughter element is the isotope's ____________________.

Accepted Answer

The answer of The time necessary for half of the...

Question 5

Prior to the discovery of radioactivity in the late ____________________ century,geologists were able to develop a(n)____________________ geologic time scale.

Accepted Answer

The answer of Prior to the discovery of radioactivity in...

Question 6

Long-lived radioactive isotope pairs used in radiometric dating have half-lives of the magnitude of ____________________ or ____________________ of years.

Accepted Answer

The answer of Long-lived radioactive isotope pairs used in radiometric...

Question 7

Different varieties of an atom that have a different number of neutrons in their nuclei are ____________________.

Accepted Answer

The answer of Different varieties of an atom that have...

Question 8

Carbon 14 is useful for archeological samples because it is effective back to approximately ____________________ years.

Accepted Answer

The answer of Carbon 14 is useful for archeological samples...

Question 9

The placement of events into a sequential order based upon their position in the rock record is referred to as ____________________ dating.

Accepted Answer

The answer of The placement of events into a sequential...

Question 10

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

The answer of The principle of original horizontality states that...

Question 11

The principle of ____________________ states that rock layers extended laterally in all directions unless or until they terminate in one of a number of natural means.

Accepted Answer

The answer of The principle of ____________________ states that rock...

Question 12

When a stalagmite has an oxygen-18 to ____________________ ratio that is low,the climate at the time the stalagmite formed was relatively ____________________

Accepted Answer

The answer of When a stalagmite has an oxygen-18 to...

Question 13

Fragments of a rock that are contained in a layer of another rock must be ____________________ in age than the layer of rock that surrounds them.

Accepted Answer

The answer of Fragments of a rock that are contained...

Question 14

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 15

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

The answer of The half-life of a radioactive element is...

Question 16

Carbon-14 dating is based on the ratio of the parent isotope ____________________ to the daughter isotope ____________________.

Accepted Answer

The answer of Carbon-14 dating is based on the ratio...

Question 17

____________________ dating is used to obtain absolute age dates.

Accepted Answer

The answer of ____________________ dating is used to obtain absolute...

Question 18

After one half-life,____________________% of the radioactive parent atoms will have decayed to stable daughter atoms.

Accepted Answer

The answer of After one half-life,____________________% of the radioactive parent...

Question 19

The most accurate radiometric dates are obtained from ____________________ rocks.Only in very unusual circumstances can ____________________ rocks be radiometrically dated.

Accepted Answer

The answer of The most accurate radiometric dates are obtained...

Question 20

A surface of discontinuity representing a break in the depositional record;a discontinuity representing erosion or nondeposition is a(n)____________________.

Accepted Answer

The answer of A surface of discontinuity representing a break...

Quiz 16: Geologic Time: Concepts and Principles

A sedimentary rock that shows evidence of contact metamorphism must be ____________________ in age than the igneous rock with which it is in contact,even if it lies above the igneous rock.

An interval of geologic time not represented by strata in a particular area is a(n)____________________.

In order to correlate age-equivalent rock units of dissimilar composition or to correlate rock units over a large area, and the principle of must be used.

The time necessary for half of the atoms of the unstable parent element to decay to the new,more stable daughter element is the isotope's ____________________.

Prior to the discovery of radioactivity in the late century,geologists were able to develop a(n) geologic time scale.

Long-lived radioactive isotope pairs used in radiometric dating have half-lives of the magnitude of or of years.

Different varieties of an atom that have a different number of neutrons in their nuclei are ____________________.

Carbon 14 is useful for archeological samples because it is effective back to approximately ____________________ years.

The placement of events into a sequential order based upon their position in the rock record is referred to as ____________________ dating.

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 principle of ____________________ states that rock layers extended laterally in all directions unless or until they terminate in one of a number of natural means.

When a stalagmite has an oxygen-18 to ratio that is low,the climate at the time the stalagmite formed was relatively

Fragments of a rock that are contained in a layer of another rock must be ____________________ in age than the layer of rock that surrounds them.

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

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.

Carbon-14 dating is based on the ratio of the parent isotope to the daughter isotope .

____________________ dating is used to obtain absolute age dates.

After one half-life,____________________% of the radioactive parent atoms will have decayed to stable daughter atoms.

The most accurate radiometric dates are obtained from rocks.Only in very unusual circumstances can rocks be radiometrically dated.

A surface of discontinuity representing a break in the depositional record;a discontinuity representing erosion or nondeposition is a(n)____________________.