Fossils
Rock of Ages
Plants and Animals
Geologic Time Scale
Geologic Jargon
100
A fossil in which mineral replace all or part of an organism are called
What are petrified fossils?
100
One is the age of rocks compared to other rocks; the other is the number of years since the rock was formed.
What are relative age and absolute age?
100
The Time Period when the earliest forms of life appeared.
What is the Precambrian Time?
100
It is a record of the life forms and geologic events in Earth's history.
What is the geologic time scale?
100
Mass extinction
What is it when many different types of living things become extinct all at once.
200
Evidence about the history of life and past environments are provided by these
What are fossils?
200
This law says that in horizontal layers of sedimentary rock the oldest layer is at the bottom; the youngest layer is on the top.
What is the law of superposition?
200
It has a backbone.
What is a vertebrate?
200
It is another name for the Mesozoic Era.
What is the age of reptiles?
200
The basic units of of the geologic time scale after Precambrian Time.
What eras and periods?
300
One is a hollow area in sediment the shape of an organism, the other is a solid copy of the shape of an organism.
What are molds and casts?
300
You won't find these in the back of a book, but they are useful in telling the relative ages of rock layers.
What are index fossils?
300
Plants and animals first appeared on land during this era.
What is the Paleozoic?
300
It is the era in which the first humans appeared, and which we are still living in at present.
What is the Cenozoic?
300
Radioactive dating
What is used to determine the absolute age of rocks?
400
They are scientists who study fossils.
What are paleontologists?
400
This occurs when magma seeps into sedimentary rock layers and hardens.
What is intrusion?
400
Humans first appeared during this era.
What is the Cenozoic Era?
400
The mighty dinosaurs ruled during this era.
What the Mesozoic Era?
400
The rate of decay of an element.
What is half-life?
500
It is defined as the gradual change in living things over long periods of time.
What is evolution
500
It is a break in Earth's crust, and is always younger than the rock it cuts through.
What is a fault?
500
They are believed to have evolved from birds.
What are reptiles?
500
Pangea formed during this era.
What is the Paleozoic Era?
500
The earliest life-forms on Earth were probably similar to these present day organisms.
What are bacteria?
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