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The geologic time scale is divided into periods, which are then divided into epochs, which are further divided into ages. For example, the time of the dinosaurs lasted 3 periods (Triassic, Jurassic, Cretaceous), each period had 3 epochs (late, early, middle), and each age fit into one of those. Many epochs have more than 1 age associated with them.
As for the basis for differentiating the eras, I'm not so sure. The only one I can say for sure is the end of the Cretaceous, which is when the dinosaurs suddenly became extinct due to a meteor impact. I think the divisions are based on significant, global-scale events that changed the world.
What else can I help you with?
What division in the geologic time scale is the shortest?
The shortest division in the geologic time scale is an Epoch. Epochs are subdivisions of a period and are typically tens of millions of years long.
What is The largest expanse of time on the geologic time scale is the?
The largest expanse of time on the geologic time scale is the eon, which is further divided into eras. Eons are the longest subdivisions of time, representing billions of years of Earth's history.
What are the two basic units of the geologic time scale?
EonEraPeriodEpoch! :)
What are the major time intervals represented by the geologic time scale?
The Geologic Time Scale is divided up by four major intervals. In order from Largest to smallest: Eons are the largest time frame covering hundreds of millions of years. Eons are divided into smaller time intervals known as Eras. Eras are subdivided into Periods. Periods are broken into finer subdivisions known as Epochs.
How do you order the geologic time intervals to longest to shortest?
The geologic time intervals from longest to shortest are eon, era, period, epoch, and age. This hierarchical sequence represents the largest divisions (eons) to the smallest subdivisions (ages) of Earth's history.
What division in the geologic time scale is the shortest?
The shortest division in the geologic time scale is an Epoch. Epochs are subdivisions of a period and are typically tens of millions of years long.
What is The largest expanse of time on the geologic time scale is the?
The largest expanse of time on the geologic time scale is the eon, which is further divided into eras. Eons are the longest subdivisions of time, representing billions of years of Earth's history.
What is the geologic time scale and what are its principal subdivisions?
The geologic time scale is a system used by geologists to organize Earth's history into distinct time periods based on major geological events and changes. Its principal subdivisions are eons (such as the Precambrian and Phanerozoic), which are further divided into eras, periods, and epochs. These subdivisions help scientists understand and study the vast expanse of Earth's history in a structured manner.
What does geologic time have to do with eras?
Eras are subdivisions of larger units of geologic time called eons.
What are the two basic units of the geologic time scale?
EonEraPeriodEpoch! :)
How are the subdivisions of geologic time relate to one another?
they all connect
What do the relative geologic time and absolute geologic time combine to form?
The geologic time scale.
What do you called the scale of time that records the events about the history of the earth?
Geologic Time. It's called the Geologic Time Scale.
What are the major time intervals represented by geologic time scale?
The Geologic Time Scale is divided up by four major intervals. In order from Largest to smallest: Eons are the largest time frame covering hundreds of millions of years. Eons are divided into smaller time intervals known as Eras. Eras are subdivided into Periods. Periods are broken into finer subdivisions known as Epochs.
Which is not a major period of the geologic time scale?
Cenozoic is not a major period of the geologic time scale. The scale is broken down into eras. Cenozoic, Mesozoic and Paleozoic are all part of the Phanerozic era.
In which eon of the geologic time scale means visable life?
Phanerozoic is the eon which geologic time scale means visable life.
Which is the largest of time on the geologic time scale?
The Precambrian
