10 Questions
What are the three parts of the Precambrian Eon?
- Hadean, 2. Archean, 3. Proterozoic
What are Hadean rocks largely consisting of and where are they found?
Granular zircons from one locality in Western Australia
When did the Hadean Eon begin and end?
Began 4.6 billion years ago, ended 4 billion years ago
What term did Preston Cloud coin to label the period before the earliest-known rocks on Earth?
Hadean
What did the Earth's early Hadean atmosphere contain and what eventually formed?
Very thick carbon dioxide- and methane-rich prebiotic atmosphere; eventually oceans made of liquid water were formed
What geological eras make up the Proterozoic Eon?
Paleoproterozoic, Mesoproterozoic, Neoproterozoic
What is the significance of the Paleozoic Era?
It began with the Cambrian explosion and ended with the end-Permian extinction, marking the development of marine life forms, land plants, and reptiles.
During which period did the first flowering plants appear?
Cretaceous Period
What is the Mesozoic Era also known as?
The Age of Reptiles
What caused the rise of multicellular organisms during the Proterozoic?
The oxygen level of Earth reaching 3%
Study Notes
Precambrian Eon
- The Precambrian Eon consists of three parts: Hadean, Archean, and Proterozoic Eons.
Hadean Eon
- Hadean rocks are largely consisting of zircon crystals and are found in Western Australia.
- The Hadean Eon began around 4.5 billion years ago and ended around 4 billion years ago.
- Preston Cloud coined the term "Hadean" to label the period before the earliest-known rocks on Earth.
Early Earth's Atmosphere
- The Earth's early Hadean atmosphere contained no oxygen and eventually formed methane and ammonia.
Proterozoic Eon
- The Proterozoic Eon consists of three geological eras: Paleoproterozoic, Mesoproterozoic, and Neoproterozoic.
Paleozoic Era
- The Paleozoic Era is significant because it saw the rapid diversification of life on Earth.
Phanerozoic Eon
- During the Silurian Period, the first flowering plants appeared.
Mesozoic Era
- The Mesozoic Era is also known as the Age of Reptiles.
Rise of Multicellular Organisms
- The rise of multicellular organisms during the Proterozoic was caused by the increase in oxygen levels in the atmosphere.
Test your knowledge on the history of Earth through the Precambrian Period, including its subdivisions like Hadean, Archean, and Proterozoic. Learn about the significant events that shaped Earth during this extensive period.
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