Geologic Time Scale Eras and Events

What division of time was the longest ?

• Paleozoic

• Mesozoic

• Cenozoic

• Precambrian

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When did Precambrian time end

• 542 million years ago

• 4.5 Billion years ago

• 3.65 Billion years ago

• 3.8 Billion years

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What era did dinosaurs go extinct ?

• Paleozoic

• Mesozoic

• Cenozoic

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What is the geological time scale ?

• A clock

• A calendar

• Something that divides Earths history into groups

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How old do Paleontologists believe the Earth is?

• 2015 years old
• 3.6 billion years old
• 4.6 billion years old
• 4.6 million years old

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What type of rock do fossils form in?

• Igneous
• Sedimentary
• Metamorphic
• Classic

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The fossil record shows that life on Earth has changed over time.  For example, paleontologists have found that older rocks contain fossils of

• organisms that are more complex than those alive today
• both simple and complex organisms
• only organisms that are alive today
• organisms that are simpler than those alive today

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What do most scientists think caused the mass extinction of dinosaurs and other organisms at the end of the Cretaceous period?

• an object from space struck Earth
• volcanic eruptions covered large areas with lava
• an ice age covered most of Earth with ice
• The dinosaurs ate too many other organisms and then starved

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NGSS.MS-LS4-1

The Paleozoic, Mesozoic, and Cenozoic are divisions in the geologic time scale called ____

• centuries
• layers
• periods
• eras

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What is the importance of studying fossils?

• to provide information about how current life forms would exist in previous environmental conditions

• to provide information about how life and environmental conditions may have changed

• to provide information about how previous life forms would exist in current environmental conditions

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