Geologic History Test Review

Question 1

What is the fraction of the original carbon-14 remaining after 34,200 years?

Accepted Answer

1/64

Question 2

The fossil record indicates that most of the plants and animals that lived on Earth in the past

Accepted Answer

have become extinct

Question 3

What is the general fossil group of Ctenocrinus?

Accepted Answer

Crinoid

Question 4

The oldest known fossils ever found were from when?

Accepted Answer

3.5 b.y.

Question 5

Which statement correctly describes an age relationship in the geologic cross section below?

Accepted Answer

The shale is younger than the basalt.

Question 6

The Precambrian Time, covers about _____% of the history on the Geologic Time Scale.

Accepted Answer

88

Question 7

According to fossil evidence, which life-forms appeared on Earth most recently?

Accepted Answer

grasses

Question 8

Which statement about the species that lived on Earth is best supported by the fossil record?

Accepted Answer

Most became extinct.

Question 9

Which isotope is most useful to find the age of a skeleton around 10,000 to 25,000 years old?

Accepted Answer

carbon-14

Question 10

The largest North American meteorite impact crater formed about 1,850 mya, which was during the

Accepted Answer

Early Proterozoic Era.

Question 11

In which epoch would a fossil be from if the sample is 1/16 Al26 and 15/16 Mg26?

Accepted Answer

Pliocene

Question 12

Unconformities (buried erosional surfaces) provide evidence that

Accepted Answer

part of the geologic record has been destroyed.

Question 13

Compared to the length of time for the first half-life of an isotope, the second half-life is

Accepted Answer

the same.

Question 14

Which type of rock is most likely to contain fossils?

Accepted Answer

shale

Question 15

The name of this era of earth's history

Accepted Answer

mesozoic

Question 16

Which event occurred earliest in geologic history

Accepted Answer

Grenville Orogeny

Question 17

If a sample of radioactive substance is crushed, the half-life of the substance will

Accepted Answer

stay the same.

Question 18

Theories of evolution suggest variations in a species give the species greater probability of

Accepted Answer

surviving environmental changes.

Question 19

Which statement best explains changes in the horse, according to the fossil record?

Accepted Answer

The horse evolved into a life-form better able to survive.

Question 20

What did the Alleghenian Orogeny form

Accepted Answer

The Appalachian Mts.

Question 21

Which event occurred earliest in geologic history?

Accepted Answer

Abundant eurypterids

Question 22

The world’s oldest known rocks can be found in Canada

Accepted Answer

True

Question 23

What is Earth's geologic history divided in ?

Accepted Answer

Eons , Eras , Periods , Epochs

Question 24

During which period did the last of these trilobite groups become extinct? ESRT

Accepted Answer

Permian

Question 25

Layers of volcanic ash often serve as useful geologic time markers, because ash layers usually

Accepted Answer

deposit quickly over a wide area.

Question 26

Why are radioactive substances useful for measuring geologic time?

Accepted Answer

Radioactive substances undergo decay at a predictable rate.

Question 27

During which geologic time span could the "game" in the cartoon have occurred?

Accepted Answer

Pleistocene Epoch

Question 28

What ESRT page is this on?

Accepted Answer

1

Question 29

The name of this Era of earth's history

Accepted Answer

Precambrian

Question 30

In which period was there NO rock record in NYS?

Accepted Answer

Neogene

Question 31

An ancient bone was analyzed and contains carbon-14 that had decayed for nearly two half-lives

Accepted Answer

11,000 years

Question 32

What is the estimated age of the Earth?

Accepted Answer

4.6 X 109 years.

Question 33

The name of this era of earth's history

Accepted Answer

paleozoic

Question 34

Which orogeny formed the Appalachian Mountains?

Accepted Answer

Alleghenian

Question 35

Which of the following is NOT a characteristic that would make a good index fossil?

Accepted Answer

The species lived over a very long geoogic time scale.

Question 36

Which feature is most useful in correlating between 2 different areas with sedimentary bedrock?

Accepted Answer

Index fossils.

Question 37

According to the Earth Science Reference Tables, studiesof the rock record suggest that

Accepted Answer

humans have existed for a brief period of time

Question 38

What's the age of the sample shown in the diagram, if the isotope's half-life is 1,000 years, ?

Accepted Answer

2,000 years

Question 39

What ESRT page is this on?

Accepted Answer

8

Question 40

In which way are index fossils and volcanic ash deposits similar?

Accepted Answer

Both often serve as geologic time markers.

Geologic History Test Review

Questions 40

Geologic History Test Review

Questions 40