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Dating Helps
Geologic Time Eras
Earth's History
100
What process breaks rocks into sediments?
What is weathering
100
Type of dating that determines the order of events (older vs younger)?
What is relative dating
100
An animal like this could be found in what era?
What is the Mesozoic
100
The age of Earth.
What is 4.5 billion years
200
What is the rule that says new layers form on top of old layers?
What is law of superposition?
200
Dating technique that gives the actual age of a rock
What is absolute dating
200
When did Earth look like this?
What is the Paleozoic era
200
What are scientists observing when they are applying the law of superposition. (DAILY DOUBLE)
What are rock layers/ sedimentary rocks
300
Original material from early Earth can be found within these types of rocks.
what are meteorites
300
A fault cuts through rock layers. Which is younger?
What is the fault?
300
Earliest part of Earth's history that accounts for 88% of Earth's Geologic time.
What is the precambrian era
300
A timeline of Earth’s history is referred as ...
What is the geologic time scale
400
A gap in the rock record (DAILY DOUBLE)
What is an unconformity
400
Time it takes for half of a radioactive element to decay
What is a half-life
400
Life like this first began in what era?
What is the precambrian era
400
What are the three main divisions of geologic time?
what are Eons, eras, periods
500
Magma that pushes into rock layers and cools underground
What is an igneous intrusion?
500
When an unstable atom breaks down into a stable one
What is radioactive decay
500
An animal with this skeleton lived in what era?
What is the Cenozoic era
500
The amount of human lifetimes there is in 1 million years, assuming a lifetime is 80 years.
What are 12,500 human lives