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Home Page Social Science Business International Marketing Around The World Lesson 4: The Geologic Time Scale. - Flashcards

Lesson 4: The Geologic Time Scale. – Flashcards

Steven Ramirez
8 July 2022
11 test answers

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question
Why do geologists use the geologic time scale?
answer
Because of the time span of Earth's past is so great, geologist use geologic time scale to show Earth's history.
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What is the geologic time scale?
answer
The geologic time scale is a record of the geologic events and the evolution of life forms as shown in the fossil record.
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How do scientists develop the geologic time scale?
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Scientists first developed the geologic time scale by studying rock layers and index fossils worldwide. With this information,scientists placed Earth's rocks in order by relative age. Later, radioactive dating helped determine the absolute age of the divisons in the geologic time scale.
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What do the divisons of geologic time scale depend on?
answer
The divisons of the geologic time scale depend on events in the history of life on Earth.
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How does geologic time begin?
answer
Geologic time begins with a long span of time called Precambrian time.
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question
When did precambrian time end?
answer
Precambrian time,which covers about 88 percent of Earth's history, ended 542 million years ago (few fossils survive from this time period)
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question
How do geologists divide the time?
answer
Geologists divide the time between Precambrian time and the present into three long units of time called eras.
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What are the eras?
answer
They are the Paleozoic eras, the Triassic period, and the Cenozoic era.
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question
How are eras divided?
answer
Eras are subdivided into units geologic time called periods.
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question
Where do the names of the geologists periods come from?
answer
The names of many of the geologist periods come from places around the world where geologists first described the rocks and fossils of that period.
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question
How is geologic time divided?
answer
Geologic time is divided into eras and periods to show the long span of Earth's history.
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What is the right structure for an essay
Answer
A paragraph is a related group of sentences that develops one main idea. Each paragraph in the body of the essay should contain:
  • a topic sentence that states the main or controlling idea
  • supporting sentences to explain and develop the point you’re making
  • evidence from your reading or an example from the subject area that supports your point
  • analysis of the implication/significance/impact of the evidence finished off with a critical conclusion you have drawn from the evidence.