Chapter 9 Concept Review
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Transcript of Chapter 9 Concept Review
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SCARY DINOSAURS
Chapter 9 Concept Review
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1. A large area of exposed Precambrian rocks is called a _________________.
shield
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.2 A large cloud from which Earth formed is called a _________________.
nebula
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3. The gradual development of new organisms from preexisting organisms is _________________.
evolution
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.5. An ordered arrangement of rock layers is a _________________.
Geologic column
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4. A unit of geologic time that is longer than an age but shorter than a period.
epoch
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6. An episode during which an enormous number of species dies is called _________________.
Mass extinction
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7. A fossil that is used to date rocks is an _________________.
Index fossil
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8. A unit of geologic time that is longer than an epoch but shorter than an era is a _________________.
period
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9. A chart outlining the development of Earth and life on Earth is the _________________.
Geologic time scale
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10 A theory that a meteorite caused the extinction of dinosaurs is called the _________________ _____________.
Impact hypothesis
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11. "206 Ma" means…
"206 million years ago.“ (d)
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12. Coastlines took on their present shapes during the __________Holocene Epoch (c)
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13. The most common Cambrian invertebrates were called ____________.
trilobites (d)
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14. Which of the following animal species evolved during the Paleocene Epoch?
Primates (c)
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15. Dividing Precambrian time into smaller time units is difficult because…
few fossils exist in Precambrian rocks. (d)
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16. Coal deposits in the eastern United States are the fossilized remains of forests and swamps from the ____________________.
Carboniferous period (b)
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17. A mass extinction of marine invertebrates occurred at the end of the Permian Period when …
shallow inland seas disappeared. (b)
**Note: letter “C” looks good because collisions of tectonic plates did lead to the disappearance of the inland seas
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18. The climate during the Mesozoic Era was generally ____________________.
warm and humid (d)
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19. The herbivore Apatosaurus belonged to the group of dinosaurs called _____________.
saurischians (a)
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20. The division of geologic time that began with the last ice age and includes the present is called the __________________.
Quaternary Period (c)