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Earth's History Test

Earth's History Test Review

QuestionAnswer
The Precambrian consists of the three earliest eons of geologic time. True
The Precambrian time occurred 11,000 years ago. False
According to the principle of superposition, the youngest rock layers are closest to the surface. False
Intrusions are older than the rocks they cut across False
An unconformity between between a sedimentary rock layer and an igneous rock layer is a disconformity. False
The oldest rock layer an an undisturbed rock sequence occurs at the bottom of the sequence
The amount of time it takes for one-half of the original amount of an isotope to decay is known as its half-life
On the geological time scale, the smallest unit of time is called an epoch
An unconformity forms when part of the rock record is destroyed
Radiometric dating is used to find the ___________ age of a rock absolute
Molds, casts, coprolites, and petrified wood are all examples of fossils
The Phanerozoic Eon includes the Paleozoic, Mesozoic, and the Cenozoic Era
Put the geologic time in order from shortest to longest. epoch, period, era, eon
An example of a fossil with altered hard parts includes petrified wood
An example of a trace fossil worm tail
Put the geologic times in order from most general to most specific epoch, era, period, eon
Superposition can be used to determine the relative age of rock layers
What characteristic of radioactive decay makes it useful for determining the absolute age of samples? occurs at a constant rate
If you wanted to determine the age of an organic material, what radioactive isotope would you use? Carbon-14
Created by: ceadams00
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