Why have no dinosaur fossils been found in rocks formed after the Cretaceous Period?

The dinosaurs died in a mass extinction during the Cretaceous Period.

What is relative dating?

Determining the age of an object/event based on older/younger observations

What is one theory about the cause of the mass extinction at the end of the Cretaceous Period?

Environmental changes (continental shifts and volcanic activity), Giant meteorite crash; it created dust and blocked the sun, chilling Earth

What changes have occurred in Earth’s climate during the Cenozoic Era?

Continental ice sheets have covered one-third of Earth’s land at times.

Where can we find evidence of changes in conditions on Earth’s surface?

Evidence of change is recorded in the rock layers of Earth’s crust.

What happened to the atmosphere during the Ordovician Period?

It reached a modern oxygen-rich state.

Why do we know so little about Precambrian Time?

Precambrian rock is hard to interpret due to deformation and alteration.

What had happened to the continents by the end of the Permian Period?

They had joined to form Pangea.

What is absolute dating?

Determining the age of an object/event in years (ex. radiometric dating)

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Earth Science Ch.9 Review

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A review of chapter 9 from the Holt Earth Science textbook.

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Questions 25

Answers

1
Why have no dinosaur fossils been found in rocks formed after the Cretaceous Period?
The dinosaurs were abducted by aliens.
The dinosaurs fought each other fervently and drove themselves extinct.
The dinosaurs died in a mass extinction during the Cretaceous Period.
The fossils were destroyed by volcanic activity and continental shifts.
2
What is relative dating?
Determining the age of an object/event in years (ex. radiometric dating)
Determining the age of an object/event based on older/younger observations
3
In what epoch did large carnivores appear?
Pliocene
Miocene
Paleocene
Pleistocene
4
What is one theory about the cause of the mass extinction at the end of the Cretaceous Period?
Environmental changes (continental shifts and volcanic activity)
Aliens attacked Earth and the assault affected Earth's climate
The moon went off course and caused huge floods and cold atmospheres
Giant meteorite crash; it created dust and blocked the sun, chilling Earth
5
What animals that were common in the Cambrian Period?
Stromalites
Brachiopods
Trilobites
Angiosperms
6
In what period did the first land plants and land animals evolve?
The Carboniferous Period
The Silurian Period
The Devonian Period
The Ordovician Period
7
What changes have occurred in Earth’s climate during the Cenozoic Era?
Continental ice sheets have covered one-third of Earth’s land at times.
Huge heat waves have warmed half the planet.
Volcanic activity has warped the Earth's crust dramatically.
Massive tropical storms have destroyed entire continents.
8
Where can we find evidence of changes in conditions on Earth’s surface?
Evidence of change is recorded in the rock layers of Earth’s crust.
Evidence of change is recorded in fossilized animal feces.
Evidence of change is found by studying large bodies of water.
Evidence of change is found by studying prehistoric animal anatomy.
9
What period is known as the Age of Fishes?
The Devonian Period
The Cambrian Period
The Silurian Period
The Ordovician Period
10
List the following units of geologic time in order of relative length, from LONGEST to SHORTEST.
Epoch, period, eon, era, age
Period, epoch, eon, age, era
Age, epoch, period, era, eon
Era, eon, epoch, age, period
11
What is the present geologic era is called?
Precambrian Time
The Mesozoic Era
The Paleozoic Era
The Cenozoic Era
12
What is the time interval that began with the formation of Earth called?
Permian Time
Precambrian Time
Cambrian Time
The Beginning
13
What era is known as the Age of Reptiles?
Precambrian Time
The Paleozoic Era
The Mesozoic Era
The Cenozoic Era
14
What happened to the atmosphere during the Ordovician Period?
The air became toxic and caused entire species to die out.
The atmosphere rapidly heated and caused forest fires to break out often.
The air spontaneously exploded due to overproduction of oxygen.
It reached a modern oxygen-rich state.
15
What era is known as the Age of Mammals?
The Paleozoic Era
Precambrian Time
The Mesozoic Era
The Cenozoic Era
16
Why do we know so little about Precambrian Time?
Precambrian rock is too rare to collect mass data from.
Precambrian rock is hard to interpret due to deformation and alteration.
There was a great flood that washed Precambrian fossils away.
Huge meteors destroyed most Precambrian rock.
17
What had happened to the continents by the end of the Permian Period?
They had joined to form Pangea.
They broke apart to form the modern continents.
They collided to form Gondwana.
They joined to create Eurasia.
18
What is a large area of exposed Precambrian rocks called?
A cover
A wall
A shield
A plate
19
What does the abbreviation Ma stand for?
Millions of years ago
Billions of years ago
Millenniums ago
Trillions of years ago
20
What is absolute dating?
Determining the age of an object/event based on older/younger observations
Determining the age of an object/event in years (ex. radiometric dating)
21
During what epoch did humans first appear?
Pleistocene
Holocene
Eocene
Miocene
22
During what time did the largest known land mammals live?
The Miocene Epoch
The Permian Period
The Oligocene Epoch
The Jurassic Period
23
What period is known as the Age of Amphibians?
The Devonian Period
The Permian Period
The Cretaceous Period
The Carboniferous Period
24
What supercontinent formed during the Mesozoic Era?
Rodinia
Pangea
Gondwana
Eursia
25
What was the dominant life-form during the Jurassic Period?
Chickens, specifically
Dinosaurs
Reptiles
Fishes

Earth Science Ch.9 Review Flashcards | StudBud