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Questions and Answers
What are the three parts that the Precambrian Eon was broken into?
What are the three parts that the Precambrian Eon was broken into?
Hadean, Archean, Proterozoic
When did the Hadean Eon begin and end?
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?
Who coined the term 'Hadean' and when?
Geologist Preston Cloud in 1972
What were Hadean rocks largely consisting of?
What were Hadean rocks largely consisting of?
What did the Earth's atmosphere contain during the Archean period?
What did the Earth's atmosphere contain during the Archean period?
What did the early Earth's atmosphere contain during the Hadean period?
What did the early Earth's atmosphere contain during the Hadean period?
During which era did the oxygen level of Earth reach 3%, leading to the rise of multicellular organisms?
During which era did the oxygen level of Earth reach 3%, leading to the rise of multicellular organisms?
What are the three geologic eras that the Proterozoic Era is subdivided into?
What are the three geologic eras that the Proterozoic Era is subdivided into?
What is the Phanerozoic Eon known as?
What is the Phanerozoic Eon known as?
How many parts is the Phanerozoic Eon broken into?
How many parts is the Phanerozoic Eon broken into?
What marks the beginning of the Paleozoic Era?
What marks the beginning of the Paleozoic Era?
What was formed during the middle Paleozoic Era?
What was formed during the middle Paleozoic Era?
What began to appear during the late Paleozoic Era?
What began to appear during the late Paleozoic Era?
What is the Mesozoic Era also known as?
What is the Mesozoic Era also known as?
Who introduced the phrase 'Age of Reptiles'?
Who introduced the phrase 'Age of Reptiles'?
What started to break apart during the Mesozoic Era?
What started to break apart during the Mesozoic Era?
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