Question 1

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 2

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 3

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 4

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 5

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 6

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

Accepted Answer

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

Question 7

Carbon 14 is useful for archeological purposes because it can effectively date samples back to approximately ____________________ years.

Accepted Answer

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

Question 8

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 9

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 10

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...

Question 11

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...

Question 12

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 13

____________________ dating is used to obtain absolute age dates.

Accepted Answer

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

Question 14

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 15

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 16

The principle of ____________________ states that rock layers extend 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 17

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 18

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 19

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 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

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

Quiz 16: Geologic Time: Concepts and Principles

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

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 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.

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

Carbon 14 is useful for archeological purposes because it can effectively date samples back to approximately ____________________ years.

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 ____________________.

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.

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

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

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

____________________ dating is used to obtain absolute age dates.

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

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

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

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

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

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

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.