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Match the following geologic time units with their description:
Eons = Largest unit of time in the geologic time scale Eras = Smaller unit of time than eons Periods = Smaller unit of time than eras Epochs = Smallest unit of time in the geologic time scale
Match the following geologic time units with the number of divisions:
Eons = Four Eras = Several Periods = Several Epochs = Several
Match the following geologic time units with the characteristic that defines them:
Eras = Significant geological or biological events Periods = Distinct rock formations and fossil records Epochs = Specific geological or biological events Eons = Major stages in the Earth's development
Match the following examples with the correct geologic time unit:
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Match the following characteristics with the correct geologic time unit:
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Match the following concepts with the correct description:
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Study Notes
Geologic Time Scale
Eons
- Largest unit of time in the geologic time scale
- Divided into four eons: Hadean, Archean, Proterozoic, and Phanerozoic
- Each eon represents a major stage in the Earth's development
- Eons are further divided into eras
Eras
- Smaller unit of time than eons
- Divided into several eras, each representing a distinct phase in the Earth's history
- Eras are characterized by significant geological or biological events
- Examples of eras include the Paleozoic, Mesozoic, and Cenozoic eras
Periods
- Smaller unit of time than eras
- Divided into several periods, each representing a specific interval of time
- Periods are characterized by distinct rock formations and fossil records
- Examples of periods include the Triassic, Jurassic, and Cretaceous periods
Epochs
- Smallest unit of time in the geologic time scale
- Divided into several epochs, each representing a short interval of time
- Epochs are often characterized by specific geological or biological events
- Examples of epochs include the Pleistocene and Holocene epochs
Fossil Record
- The fossil record provides a chronological record of the history of life on Earth
- Fossils are remains or impressions of ancient organisms preserved in rock
- The fossil record is used to date rocks and reconstruct the Earth's history
- Fossils are often used to correlate rock formations and determine the relative age of rocks
- The fossil record provides evidence for evolution and plate tectonics
Geologic Time Scale
Eons
- The largest unit of time, representing a major stage in the Earth's development
- Divided into four eons: Hadean ( Earliest phase of Earth's formation), Archean (oldest life forms), Proterozoic (oxygenation of atmosphere), and Phanerozoic (complex life forms)
Eras
- Characterized by significant geological or biological events, such as the formation of oceans or the development of life
- Examples include the Paleozoic (ancient life forms), Mesozoic (age of reptiles), and Cenozoic (age of mammals) eras
Periods
- Characterized by distinct rock formations and fossil records, such as the Triassic (early dinosaurs), Jurassic (dinosaurs dominate), and Cretaceous (flowering plants and modern mammals) periods
Epochs
- Short intervals of time, often characterized by specific geological or biological events, such as the Pleistocene (ice ages) and Holocene (current epoch) epochs
Fossil Record
- Provides a chronological record of the history of life on Earth through fossil remains or impressions of ancient organisms
- Used to date rocks and reconstruct the Earth's history
- Fossils are used to correlate rock formations and determine the relative age of rocks
- Provides evidence for evolution and plate tectonics
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Description
Explore the largest units of time in the geologic time scale, including eons and eras, and learn about their significance in the Earth's development. Discover how they are divided and characterized by major geological and biological events.
