The
Beginning
Beginning
It is the largest phase or section in geologic time
Eons
The formation of Earth and early differentiation of its layers.
Hadean
Each era is further divided into ____, which represent significant geological or biological events.
Period
this is The largest extinction event, wiping out nearly 95% of marine species.
End-Permian Extinction
this measures the decay of radioactive isotopes.
radiometric dating
What are the four types of Eons called?
Hadean , Archean, Proterozoic, Phanerozoic
The development of Earth's crust and the emergence of early life.
Archean
Within the Mesozoic era. this is known for the dominance of dinosaurs.
Jurassic Period
this is The event that led to the demise of the dinosaurs, likely caused by an asteroid impact.
Cretaceous-Paleogene (K-Pg) Extinction
this is known for the study of rocks layers and their relative ages.
stratigraphy
Is the record of the life forms and geological events in Earth’s history
Geological time scale
The rise of oxygen in the atmosphere and the evolution of complex life forms.
Proterozoic
this is The smallest units of time, representing specific intervals within epochs?
Ages
These are significant biological events that help define the time scale.
Evolutionary Milestones
this serves as critical markers in understanding evolutionary history, helping to define the boundaries between different time divisions in the scale.
Fossil Record
helped determine the absolute divisions in the time scale
Radioactive dating
The era of visible life, marked by the proliferation of plants, animals, and fungi.
Phanerozoic
Following the mass extinction event that wiped out the dinosaurs, mammals began to diversify and occupy new ecological niches.
Paleocene Epoch
Events where a significant number of species go extinct across the globe.
Mass Extinctions
this is used to determine a fossils approximate age by comparing it to similar rocks and fossils of known ages?
Relative Dating
How is Time Divided?
Bonus!
Each eon is divided into_____ which are distinguished by major events in Earth’s history.
Eras
What is the current epoch, marking the rise of human civilization and the development of agriculture, urbanization, and significant environmental changes.
Holocene Epoch
What are the key factors that drive glaciations, and how did they shape Earth's surface?
Ice Ages and Glaciations
Scientists use various methods to determine the age of rocks and fossils.
Dating Techniques