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Q2 EARTH SCI > Radiometric Dating > Flashcards

Radiometric Dating Flashcards

1
Q

Determines the sequence of events and their relative ages, but not their specific numerical age

A

Relative Dating

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2
Q

A method used for sequencing rock layers, fossils, and geologic events

A

Relative Dating

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3
Q

What are commonly used in Relative Dating?

A

Stratigraphy, Fossil Correlation, and the Principle of Cross-Cutting Relationships

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4
Q

Compares the abundance of a radioactive isotope to its decay products

A

Absolute Dating

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5
Q

Crucial for determining the age of archaeological and geological specimens

A

Absolute Dating

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6
Q

The two methods of Radiometric Dating

A

Relative Dating and Absolute Dating

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7
Q

What are the isotopes used in Absolute Dating?

A

C-14, K-40, U-238, U-235, Rb-87, and Th-232

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8
Q

HALF-LIFE IN YEARS; USAGE; ELEMENT IT DECAYS INTO

C-14

A

5 730; organic remains up to 50 000 years; N-14

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9
Q

HALF-LIFE IN YEARS; USAGE; ELEMENT IT DECAYS INTO

U-238

A

4.5 B; dating old rocks and minerals; Pb-206

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10
Q

HALF-LIFE IN YEARS; USAGE; ELEMENT IT DECAYS INTO

K-40

A

1.25 B; dating igneous rocks, ancient geological events such as formation of mountain ranges and crystal evolution; Ar-40

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11
Q

HALF-LIFE IN YEARS; USAGE; ELEMENT IT DECAYS INTO

Rb-87

A

49 B; extremely old, ancient rocks; Sr-87

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12
Q

HALF-LIFE IN YEARS; USAGE; ELEMENT IT DECAYS INTO

Th-232

A

14 B; geological processes; Pb-208

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13
Q

The amount of time it takes for half of a sample of a substance to decay

A

Half-Life

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14
Q

HALF-LIFE IN YEARS; USAGE; ELEMENT IT DECAYS INTO

U-235

A

704 M; dating relatively young rocks and mineral up to 1 B; Pb-207

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15
Q

What is the age of the oldest fossil recorded?

A

3.5 B years old

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16
Q

The oldest fossil recorded

A

Stromatolites

17
Q

What bacteria does stromatolites come from?

A

Cyanobacteria

18
Q

What is the age of the oldest mineral recorded?

A

4.4 B years old

19
Q

The oldest mineral recorded

20
Q

What is the age of Earth?

A

4.5 B years old

21
Q

Remains or imprint of an organism used to identify the ages of stratas

A

Index Fossil

22
Q

Sub-atomic particles called nucleons

A

Protons and Neutrons

23
Q

The only isotope without a neutron

24
Q

The four fundamental forces

A

Gravity, Electromagnetic, Strong Nuclear Force, and Weak Nuclear Force

25
Q

The force that involves anything with touch and electrons

A

Electromagnetic

26
Q

The force that keeps together the nucleus of an atom

A

Strong Nuclear Force

Q2 EARTH SCI (3 decks)

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