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Questions and Answers
What percentage of Earth's history is represented by the Paleozoic Era?
What percentage of Earth's history is represented by the Paleozoic Era?
6%
What is the age of the Earth in billion years?
What is the age of the Earth in billion years?
4.6 billion
What is the term used to describe the relatively stable and immobile part of a continent?
What is the term used to describe the relatively stable and immobile part of a continent?
craton
What is the term used to describe the exposed portion of the crystalline basement rocks of a continent?
What is the term used to describe the exposed portion of the crystalline basement rocks of a continent?
What is the term used to describe a shallow inland sea that transgressed and regressed over the craton?
What is the term used to describe a shallow inland sea that transgressed and regressed over the craton?
What are the three major geological eras in Earth's history?
What are the three major geological eras in Earth's history?
What is the term used to describe the part of a continent where flat or gently-dipping sedimentary rocks were deposited?
What is the term used to describe the part of a continent where flat or gently-dipping sedimentary rocks were deposited?
Define cratons.
Define cratons.
What is the term used to describe elongated areas of mountain-building activity?
What is the term used to describe elongated areas of mountain-building activity?
What is the term used to describe a shallow inland sea that transgressed and regressed over the craton?
What is the term used to describe a shallow inland sea that transgressed and regressed over the craton?
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Study Notes
Paleozoic Era
- The Paleozoic Era comprises approximately 12% of Earth's history.
Earth's Age
- Earth is estimated to be 4.54 billion years old.
Craton
- Craton refers to the stable and immobile portion of a continent.
Shield
- Shield describes the exposed portion of the crystalline basement rocks found within a craton.
Epicontinental Sea
- A shallow inland sea transgressively and regressively over the craton, termed an epicontinental sea.
Geological Eras
- The three major geological eras of Earth's history are the Paleozoic, Mesozoic, and Cenozoic Eras.
Platform
- Platform describes the part of a continent where flat or gently-dipping sedimentary rocks were deposited.
Cratons
- Cratons are the stable and immobile portions of a continent. They form the heart of continents with shields (exposed basement rocks) and platforms (flat or gently-dipping sedimentary rocks).
Mobile Belts
- Mobile belts are elongated areas of mountain-building activity.
Epicontinental Sea
- A shallow inland sea that transgressed and regressed over the craton.
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