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Ch. 13: A Record of the Earth's History Flashcards | StudBud
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Ch. 13: A Record of the Earth's History
Ch. 13: A Record of the Earth's History
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#fossils #Eras
Flashcards
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Questions
26
Answers
1
Describe the Paleozoic Era
Volcanoes and simple lif forms
More Mammals and humans
Fish, amphibians, and reptiles
Dinosaurs, mammals, and birds
2
What fossil forms with a cast and a mold?
Petrification
Imprint
3
A rock or feature that cuts through must be younger than the layer it cuts
Superpositioning
Crosscutting
4
What rule says that the youngest layer are on top and the oldest is on the bottom?
Crosscutting
Superpositioning
5
Describe the Mesozoic Era
More mammals and humans
Volcanoes and simple life forms
Dinosaurs, mammals, and birds
Fish, amphibians, and reptiles
6
Uranium-238 would be used to determine the age of what fossils?
Fossils less than 50,000 years old
Fossils more than 50,000 years old
7
What is a radioactive element's half-life?
Length of time required for half the atoms to decay
Time it spends as a goth teen
8
Describe the Precambrian Era
the era with dinosaurs, mammals and birds
the era with fish, amphibians, and reptiles
Oldest and longest era. Has lots of volcanoes, simple life
the era with mammals and humans
9
What is geological time?
All the time that has passed since the Cenozoic Era.
All the time that has passed since the earth formed
10
What is a fossil?
An old human who doesn't understand
Traces or remains of an organism in the earth's crust
11
How did the Earth Change during the Cenozoic Era?
North America joined to South America
Half of North America submerged
Rise of the Sierra Nevadas and the Coast Ranges
Lots of volcanoes
12
Decides which of two rocks is older
Absolute dating
Relative dating
13
How can a rock's absolute age be determined?
By comparing the radioactive element in a rock
By comparing it to other rocks
14
What is the geologic time scale?
an outline of the events in earth's history
an outline of events in mankind's history
an outline of the sun's history
an outline of baseball scores
15
How did the earth change during the Paleozoic Era?
Half of North America submerged
North America joined to South America
Rise of Sierra Nevadas and the Coast Ranges
Lots of volcanoes
16
How did the earth change during the Precambrian era?
Lots of volcanoes
Half of North America submerged
North America Joined to South America
Rise of Sierra Nevadas and Coast Ranges
17
How long ago was the Cenozoic era?
245 million to 65 million years ago
540 million to 245 million years ago
65 million years ago to the present
18
How long ago was the Paleozoic Era?
540 million to 245 million years ago
245 million to 65 million years ago
65 million years ago to the present
19
Estimates the actual age of a rock or fossil
Absolute dating
Relative dating
20
What is the process of petrification?
Organism decays, leaving an imprint which fills with mud
Minerals in water replace the original organism
21
What fossil forms when an organism is preserved in ice, frozen soil, tar, or amber?
Petrification
Actual organism saved
Mold and cast
22
How did the earth change during the Mesozoic Era?
North America joined to South America
Lots of volcanoes
Rise of the Sierra Nevadas and Coast Ranges
Half of North America submerged
23
How long ago was the Mesozoic Era?
245 million to 65 million years ago
65 million years ago to the present
540 million to 245 million years ago
24
What fossil forms when minerals in groundwater replace original parts?
Actual body is preserved
Petrification
imprint in a cast or mold
25
What is the process of a cast and mold?
Minerals in water replace the original organism
Organism leaves an imprint, then decays, leaving a mold
Mold fills with minerals and makes a cast of the imprint
26
Describe the Cenozoic Era
Dinosaurs, mammals, and birds
Fish, amphibians, and reptiles
More mammals and humans
Volcanoes and simple life forms
