Unit 4A: Earth's History Exam Review
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| What has the study of fossils allowed scientists to do? | show 🗑
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| What are ideal conditions to fossilize remains of an ENTIRE organism? | show 🗑
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| show | True
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| show | When minerals replace parts of an organism
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| show | It's age compared to the rock layers that surround it
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| show | It's age in years
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| How is the absolute age of a rock determined? | show 🗑
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| show | The number of years it takes for half of the radioactive element to decay.
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| show | The half-life is the point on the graph (in years) in which 50% of the radioactive content has decayed
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| When determining the relative age of rocks, the concept that 'the deeper the rock layer, the older the rock' is known as: | show 🗑
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| show | First, a rock layer is eroded.
Second, a new sediment layer is deposited.
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| show | Radioactive decay.
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| When did marine invertebrates first appear in the fossil record? | show 🗑
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| When did marine vertebrates first appear in the fossil record? | show 🗑
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| When did amphibians first appear in the fossil record? | show 🗑
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| show | The Mesozoic era
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| show | The Cenozoic era
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| show | Humans appear in the fossil record.
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| The record of geologic events and the history of the evolution of life forms as shown in the fossil record is commonly called the: | show 🗑
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| In a diagram of rock layers, how could you determine which rock layer is the oldest? | show 🗑
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| In relative aging of rocks, if a boundary between rock layers has been eroded away and a new sediment layer has been deposited on top, what is that called? | show 🗑
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| show | It is divided into Eons, eras, periods, and epochs.
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| How/why do geologists use the Geologic Time Scale? | show 🗑
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| show | 24 minutes
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| show | True,
Geologists have divided Earth's long history into eons, eras, periods, and epochs.
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| What information in the fossil record helps Geologists determine the boundaries between time periods in the Geologic Time Scale? | show 🗑
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| How did Geologists develop the Geological Time Scale? | show 🗑
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| show | A fossil used by geologists for indexing and defining geologic periods
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| True or False? Earth's atmosphere, oceans, and continents began to form during the first several hundred million years of Precambrian time. | show 🗑
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