What are the two methods for determining a fossil’s age?

• Relative-age dating and absolute-age dating

• Carbon dating and uranium dating

• Fossil dating and rock dating

• Sedimentary dating and igneous dating

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Which form of dating is easier to determine?

• Absolute-age dating

• Relative-age dating

• Carbon dating

• Fossil dating

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In absolute-age dating, what do scientists use to measure the age of fossils?

• Radioactive decay

• Carbon dating

• Fossil layers

• Sedimentary layers

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Since it is hard to determine the absolute age of sedimentary rock, what is a common way for determining the age of fossils formed in sedimentary rock?

• Finding the ages of igneous layers above and below

• Using carbon dating

• Measuring the sedimentary layers

• Using fossil layers

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What unit of measure is used for the geologic time scale?

• Eons

• Years

• Decades

• Centuries

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What are two types of changes that can cause extinction?

• Sudden changes and gradual changes

• Climate changes and tectonic shifts

• Volcanic eruptions and meteorite impacts

• Human activities and natural disasters

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The geologic time scale is divided into different time units called ___.

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