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Science > Exam- Geologic Time > Flashcards

Exam- Geologic Time Flashcards

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Biology 101 flashcards
1
Q

Era of reptiles/dinosaurs

A

Mesozoic

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2
Q

Time it takes for half of an unstable isotopes to decay

A

Half life

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3
Q

Law that states sedimentary rocks are laid down in level layers

A

Horizontality

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4
Q

Stable isotope that results from the decay of the parent isotope

A

Daughter

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5
Q

How long ago the earth formed

A

4600 mya

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6
Q

Rocks that form from cemented sediments

A

Sedimentary

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7
Q

Longest and oldest era

A

Precambrian

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8
Q

Faults and magma intrusions are younger that the rock layers they cut through

A

Cross cutting

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9
Q

Unstable radioactive isotope of an element

A

Parent

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10
Q

Era of mammal

A

Cenozoic

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11
Q

Actual age in years of rock layers

A

Absolute age

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12
Q

Sequence of events, not actual age in years

A

Relative age

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13
Q

Era of fish and amphibian

A

Paleozoic

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14
Q

Which geologic time principal tells us that rock layers are older as you go down through a rock sequence

A

Superposition

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15
Q

A break in the rock record is a

A

Uncomformidy

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16
Q

Which scenario list the units of geologic time in order from largest to smallest

A

Eon era period epoch

17
Q

Fossil type where once living material is replaced by Rock

A

Altered

18
Q

Era we live in

A

Cenozoic

19
Q

Break in rock record between two sedimentary rock layers

A

Discomformity

20
Q

Isotope formed from a radioactive isotope

A

Daughter

21
Q

Rocks are laid down in horizontal layers

A

Horizontality

22
Q

Rock that forms from sediment cemented together helps us understand earths history

A

Sedimentary

23
Q

Atoms of the same element with a different mass numbers due to very number of neutron

A

Isotope

24
Q

The loss of radioactive particles result in an isotope changing over time the original isotope (parent) changes into a new isotope (daughter) is a loses particles

A

Radioactive decay

25
Q

Time it takes for half of the parent to change into the daughter isotope by comparing the amount of parent versus daughter isotope remaining in the sample you can determine the age of the sample

A

Half-life

26
Q

The idea that processes occurring on earth today where occurring in the past

A

Uniformitarism

27
Q

Fragments in a rock layer are older than the rock layer that contains

A

Principle of inclusions

28
Q

Evidence of teeth shells and sometimes even flush organism are found

A

Unaltered remains

29
Q

When the tissue of the ones living organism is replaced by mineral matter

A

Altered remains

30
Q

Form in a shell or other structure is buried in sediment then dissolved by groundwater evening impression of the external structure

A

Molds

31
Q

Form when molds are later filled with mineral matter

A

Casts

Science (11 decks)

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