Why are time periods in the geologic time scale are not even in length?
They are based on the type of fossils found in rock layers of the earth.
They are based on a different type of calendar used to track Earth's history.
They are baed on the thickness of the Earth's rock layers.
They are based on important events happened in Earth's history.
1. A body of a jellyfish
2. Rare metal on earth called Iridium is found in layers where dinosaurs appeared
3. Fossils found in lower rock layers are older than fossils found in upper layers
4. They are based on important events that happened in Earths history.
These are the answers
need help pls
They are based on important events happened in Earth's history.
is this correct?
@Les
is right
have a nice day
Well, you see, the geologic time scale is a bit like a concert lineup. Some time periods just want to be the headliners and get all the attention, so they stretch themselves out, while others are like the opening acts and want to just get their time on stage over with quickly. It's all about finding the right rhythm, you know? So, to answer your question, the time periods in the geologic time scale aren't even in length because they're trying to create a rockin' show! Keep it groovy!
The correct answer is: They are based on important events that happened in Earth's history.
The geologic time scale is a way to divide and categorize Earth's history into different periods of time. These periods are not evenly distributed because they are based on significant events, such as major changes in Earth's climate, the emergence of new species, or large-scale tectonic events.
To determine the duration and boundaries of these periods, scientists study and analyze a variety of evidence, including the fossil record, rock formations, and isotopic dating. By examining layers of rocks, scientists can often find fossils that are unique to specific time periods, allowing them to establish the chronology and duration of different periods in Earth's history.
For example, the boundary between the Cretaceous and Paleogene periods, marked by the mass extinction event that wiped out the dinosaurs, is an important event used to divide these two periods. Similarly, the boundary between the Paleozoic and Mesozoic eras is defined by a significant extinction event known as the Permian-Triassic extinction.
Overall, the irregular lengths of time periods in the geologic time scale reflect the significant changes and events that have shaped Earth's history.