Geologic Time - Precambrian Period

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What are the three parts that the Precambrian Eon was broken into?

Hadean, Archean, Proterozoic

When did the Hadean Eon begin and end?

Began 4.6 billion years ago, ended 4 billion years ago

Who coined the term 'Hadean' and when?

Geologist Preston Cloud in 1972

What were Hadean rocks largely consisting of?

Granular zircons from one locality in Western Australia

What did the Earth's atmosphere contain during the Archean period?

Methane with little to no oxygen

What did the early Earth's atmosphere contain during the Hadean period?

Carbon dioxide and methane

During which era did the oxygen level of Earth reach 3%, leading to the rise of multicellular organisms?

Proterozoic Era

What are the three geologic eras that the Proterozoic Era is subdivided into?

Paleoproterozoic, Mesoproterozoic, Neoproterozoic

What is the Phanerozoic Eon known as?

Eon of visible life

How many parts is the Phanerozoic Eon broken into?


What marks the beginning of the Paleozoic Era?

Cambrian explosion

What was formed during the middle Paleozoic Era?

Marine life forms with shells

What began to appear during the late Paleozoic Era?


What is the Mesozoic Era also known as?

Age of Reptiles

Who introduced the phrase 'Age of Reptiles'?

Gideon Mantell

What started to break apart during the Mesozoic Era?


Test your knowledge of Earth's history through the Precambrian Period, including the Hadean, Archean, and Proterozoic Eons. Explore the significant events and developments that shaped the Earth during this ancient period.

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