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EARTH SCIENCE (Periodical Exam) Reviewer > MODULE 10 - Different Methods of Determining the Age of Stratified Rocks > Flashcards

MODULE 10 - Different Methods of Determining the Age of Stratified Rocks Flashcards

1
Q

What do geologists use to figure out if a rock is older or younger than another
rock

A

Relative dating

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2
Q

What absolute dating technique depends on the traces of radioactive isotopes
found in fossils?

A

Radiometric

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3
Q

It is the process of breaking down of isotopes.

A

Radioactive decay

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4
Q

It is known as atoms of the same element that have the same number of protons
but different numbers of neutron?

A

Absolute dating

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5
Q

What term is used to describe absolute dating?

A

Exact

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6
Q

What can be used to show the approximate age of rock?

A

Fossil index

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7
Q

In a canyon, where is youngest rock located

A

Top

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8
Q

What is a gap in the rock sequence?

A

Unconformity

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9
Q

What is the time needed for one-half of the parent atoms to turn into daughter
atoms?

A

Half-life

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10
Q

What technique uses the half-life of atoms to figure out the age of the rock
layers the atoms are in?

A

Radiometric

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11
Q

What method has helped scientists to determine the exact age of Earth?

A

Absolute dating

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12
Q

What is a good element to use to date fossils and some rock?

A

Carbon

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13
Q

What technique explains that the lowest layer is the oldest while the topmost
layer is the youngest layer just like the clothes in the laundry basket?

A

Stratigraphy

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14
Q

What method evaluates the exact age of the sample?

A

Absolute dating

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15
Q

What type of dating method can be used on rock layers by applying the law
of superposition?

A

Relative dating

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16
Q

What indicates the relative age of a rock layer?

A

The position of the layer compared to other layers

17
Q

How can the absolute age of a rock be determined?

A

By measuring the amount of isotope and calculating the half-lives passed

18
Q

How many half-lives have passed if a rock contains 25% isotopes and 75%
daughter isotopes?

A

2 half-lives

19
Q

What describes relative dating?

A

Arranges fossils in order

20
Q

The half-life of carbon-14 is known to be 5720 years. It is the the most
popular and widely used types of radioactive isotope. Why do you think it is
a good element to use to date fossils and some rock?

A

Shorter half-life means more accurate age

21
Q

What happens when the isotopes decay?

A

Parent isotopes become half

22
Q

What is the importance of dating?

A

It determines the age of fossils

23
Q

What is the extended version of the stratigraphy?

A

Biostratigraphy

EARTH SCIENCE (Periodical Exam) Reviewer (11 decks)

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