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21 Cards in this Set
- Front
- Back
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Relative age |
When a age of a rock is compared to another rock |
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Absolute age |
The age of a rock given as the number of years since the rock formed |
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fossil |
Preserved remains of things that lived in the past |
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Radioactive decay |
The process of determining a age of an object |
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Geologic time scale |
A record of the geologic events in life forms |
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Unconformity |
A gap in the geologic record |
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PERIOD |
One of the units of geologic time |
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Era |
One of the three units of geologic time |
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Vertebrate |
Animal without a backbone |
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Invertebrate |
An animal with a backbone |
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Amphibian |
A cold blooded animal |
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Reptile |
A vertebrate. temp determined of temp of environment |
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Mass extinction |
How many species died |
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Mammal |
A vertebrate. Body temp/internal heat |
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Igneous rock |
Is younger then The rock it covers |
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Faults |
It’s always younger than the rock it cuts through |
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What is the youngest rock and what is the oldest rock in like a mountain |
The top is the youngest the bottom is the oldest |
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Precambrian time |
Is 88% of earths history |
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Paleozoic era |
Life increased completely and Pangaea formed |
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Mesozoic era |
Dinosaurs and Pangea breaking apart |
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What is Pangaea |
It is a supercontinent that formed 335 million years ago |
