Proterozoic eon
- noun
- /ˌproʊtəˈroʊzɔɪk ˈiːɒn/
- Specialized
:
eón proterozoico
- The Proterozoic eon saw the emergence of simple multicellular life forms in Earth's oceans.
Examples
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The end of the Proterozoic eon is marked by the rise of more complex life during the Cambrian period.
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Scientists study rocks from the Proterozoic eon to learn about the planet's early atmosphere.
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The Proterozoic eon was crucial for the development of life on Earth.
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Many fossils from the Proterozoic eon reveal early multicellular organisms.
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Scientists study rocks from the Proterozoic eon to learn about the planet's early atmosphere.
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The Proterozoic eon saw the emergence of simple multicellular life forms in Earth's oceans.
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Many fossils from the Proterozoic eon reveal early multicellular organisms.
Synonyms
A long time in Earth's history 2,500 to 544 million years ago when oxygen rose and multicellular life appeared
Surface Forms
Morphology
The phrase combines a specific geologic name 'Proterozoic' with the generic noun 'eon', so its meaning (the Proterozoic geological time period) is directly derivable from the constituents. Although technical, the composition is fully compositional and follows standard naming patterns for geological periods, so a learner who knows both words will understand it.
Etymology
Proterozoic eon comes from Greek words meaning 'earlier' (protero-) and 'life' (-zoic) and uses eon for 'a very long time'. That image explains why the term names the long period about 2,500 to 544 million years ago when simple life first appeared.
