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Earth Science
Freshman Earth Science Chapter 13 Study Guide
| Question | Answer |
|---|---|
| Why is little known about Precambrian history? | Many rocks of this age are metamorphosed, eroded, or subducted. |
| Organisms that changed the atmosphere | Cyanobacteria |
| Large core areas of Precambrian rocks that make up the surface of some continents | Shields |
| Source of information about about Precambrian rocks | Ores |
| Some of Earth's oldest rocks | Greenstone |
| What is true about the Precambrian fossils? | Precambrian fossils made by cyanobacteria are stromatolites. Also Prokaryotes evolved before eukaryotes. |
| True or False: Stromatolites are trace fossils. | True |
| What is a mass extinction? | Were many groups of organisms dies in a short time. |
| What is the first period of the Paleozoic? | Cambrian |
| During the Ordovician, the first __________________ plants evolved. | Land-dwelling |
| True or False: The continent of Laurasia was composed of the present-day continents of North America, Europe, and Australia. | False |
| Among the animals that evolved during the Carboniferous were the first ________________. | Reptiles |
| True or False: As the Permian period began, all the continents had fused into the supercontinent of Pangaea. | True |
| What are two hypotheses about the mass extinction of species that ended the Permian? | Volcanic eruptions led to climate change or an asteroid impact. |
| What was the dominant land animals during the Cenozoic era. | Mammals |
| True or False: The Cenozoic period is often called " age of mammals." | True |
| True or False: Plate interactions during the Tertiary caused many events including mountain building. | True |
| True or False: Grasses developed and spread rapidly over the plains during the Tertiary. | True |
| What are three adaptations of teeth in mammals? | Plant eaters develop flat molars.; Rodents develop self-sharpening front teeth.; Meat eaters evolve sharp front teeth. |
| What is true about mammals during the Quaternary. | Milankovitch cycles provide a partial explanation for recent ice ages and Many very large mammals evolved. |
| What may have caused the extinctions of large mammals at the end of the last ice age? | Disease or climate changes; human hunting habits. |
| What were the three periods that divided the Mesozoic era? | Triassic/ Jurassic/ Cretaceous |
| What is true about the Triassic period. | When the Triassic began, much of the world's land was in one supercontinent. ; Very few plant fossils were found from the Triassic period. ; Toward the end of the Triassic, mammals evolved. |
| True or False: Gymnosperms became common during the Triassic. | True |
| What were some unusual features of the ichthyosaurs and the plesiosaurs? | Streamlined bodies similar to those of dolphins, but they kept their reptilian teeth and breathed using lungs. |
| True or False: All dinosaurs were large. | False |
| True or False: Angiosperms evolved during the Cretaceous. | True |
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Briddgetr