Geologic Timesclae.strybrd
Snemalna Knjiga Besedilo
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- Sir, it 's a unit of time measurement
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- Good day everyone!Today, we were going to talk aboutThe GeologicTimescale
- perfecto !
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- taken by a process or sequence of events.
- Do you have any idea what a Timescale is?
- what are those four-level hierarchy of time intervals, sir?
- The geologic time scale is the “calendar” for events in Earth history. Moreover, it is a system of chronological dating that classifies geological strata in time.
- Geologic time is divided into a four-level hierarchy of time intervals
- moving forward
- 1.) Eons - are the longest portions of geologic time 2.) Era – smaller time interval that divides the eon.
- Those are the definition of Four-level hierarchy in Geologic Timescale
- 3.) Period – eras are subdivided into periods.4.) Epoch – finer subdivision of time is possible and the periods are frequently subdivided into epochs.
- Next, I will give you an example of significant events that happen using geologic time scale
- ~ Eon ~ Era ~ Period ~ Epoch
- The first appearance of plant life on Earth
- The first land plants appeared around 470 million years ago, during the Ordovician period. They were non-vascular plants.
- EXAMPLE #01
- The first appearance of Animals on Earth
- The first animals- including the common ancestor of all animals today, evolved in the sea. Cooperating cells eventually became the first animals, which DNA evidence suggests evolved around 800 million years ago
- EXAMPLE #02
- The formation of Earth's mountains
- The world's tallest mountain ranges form when pieces of Earth's crust—called plates—smash against each other in a process called plate tectonics
- EXAMPLE #03
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