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rocks and fossils

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Aida Medhurst

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Q: How do scientist determine when an era begins and when it ends?
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How do you know when an era ends?

a big event like a massive extinction ends an era.


How do scientists determine when one era ends?

Scientists determine when one era ends by looking at significant geological, climatic, or biological events that mark a distinct change in the earth's history. These events are usually reflected in the rock record or fossil record and help to establish boundaries between different geological eras.


Who was the most famous scientist of the Hellenistic era?

The famous scientist of the Hellenistic era was Archimedes.


What two events do historians use to mark the end of the Hellenistic Era?

The Hellenistic period begins in 323 with the death of Alexander the Great and ends with the battle of Actio in 31 BC


What era is when life begins?

Precambrian


How do you determine the end of an era?

It was science that named and decided on the era's in the first place, so they determine them by matching what another scientist has said is one era or another. Usually era's are defined by some cataclism.


If the isochron slope is 0.0362 when does the Proterozoic Era begins?

2500 m


How do scientist know that K-T extincation took place?

From the PALEOZOIC ERA.


What term do scientist use to apply to the Cenozoic Era?

It is often called the "Age of the Mammals"


A new millennium began on January 1 2001 but the 21st century began on January 1 2000 true or false?

False. A new decade, century, or millennium, etc. begins on a year that ends in 1, not 0 (unless you follow a Common Era timeline).


What soap begins with the letter E?

The Edge of Night (soap opera) ERA (detergent)


What is a brand name that begins with e?

Earrings :D