Podcast
Questions and Answers
Which unit on the geologic time scale is the oldest recorded?
Which unit on the geologic time scale is the oldest recorded?
- Era
- Epoch
- Eon (correct)
- Period
When did the Archean Eon begin and end?
When did the Archean Eon begin and end?
- 2.5 billion years ago to 2.1 billion years ago (correct)
- 2.5 billion years ago to 4.6 billion years ago
- 2.1 billion years ago to 4.6 billion years ago
- 4.6 billion years ago to 2.5 billion years ago
Where were the oldest Zircon grains found?
Where were the oldest Zircon grains found?
- Africa
- South America
- Australia (correct)
- Antarctica
What is the main source of our knowledge about the Earth's earliest history?
What is the main source of our knowledge about the Earth's earliest history?
How did the oxygen content in today's atmosphere slowly accumulate through time?
How did the oxygen content in today's atmosphere slowly accumulate through time?
During which eon did the Archean Eon occur?
During which eon did the Archean Eon occur?
What is the approximate age of the oldest recorded unit on the geologic time scale?
What is the approximate age of the oldest recorded unit on the geologic time scale?
Where were the oldest Zircon grains found?
Where were the oldest Zircon grains found?
What is the main source of our knowledge about the Earth's earliest history?
What is the main source of our knowledge about the Earth's earliest history?
During which eon did the Archean Eon end?
During which eon did the Archean Eon end?
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Study Notes
Geologic Time Scale
- The Hadean Eon is the oldest recorded unit on the geologic time scale.
Archean Eon
- The Archean Eon began around 3.8 billion years ago and ended around 2.5 billion years ago.
- It occurred during the Precambrian Supereon.
Oldest Zircon Grains
- The oldest Zircon grains were found in Western Australia, specifically in the Jack Hills.
Earth's Earliest History
- The main source of our knowledge about the Earth's earliest history is Zircon grains.
- These grains provide evidence of the Earth's earliest crust and the evolution of the atmosphere.
Oxygen Accumulation
- The oxygen content in today's atmosphere slowly accumulated through time as a result of oxygen-producing cyanobacteria.
Age of the Oldest Recorded Unit
- The approximate age of the oldest recorded unit on the geologic time scale is around 4.5 billion years old.
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