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Science chapter 11 geologic time(for final exam) flashcard

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Eras are not equal divisions of time while hours are not. How is the relationship between eons and eras different than the relationship between hours and minutes? epoch, period, era, eonShows the divisions of the geologic time line from least to greatestgas and dust and gas from volcanoesThese could cause a mass extinction. There are no fossils of dinosaurs in the rocks above the iridium layers. What is one reason the presence of iridium leads scientists to hypothesize that meteorite impact caused the mass extinction of dinosaurs? species adapt to a change in the enviormentEvolution occurs when__________A land bridge allows a species to move to a new environment. The species must then adapt to that new environment to survive. How do land bridges contribute to changes in a species? the age of the invertebratesThere were so many animals without backbones in the Early Paleozoic that it is often calledTectonics plates moved in such a fashion that the continents all came together into a super continent. How was Pangaea formed? middle PaleozoicDuring the________ the Appalachians mountains formed. Both would eject ash and rock into the atmosphere, reducing temperatures. Why do scientists hypothesize that either volcanic explosions or a meteorite impact led to the Permian mass extinction? ocean water flooding a continentWhat forms an inland sea? Middle PaleozoicVertebrates begin to appear during which era? TriassicWhen did Pangaea begin to split up? All the ice caps and glaciers had meltedWhat was the source of the water for the formation of the Atlantic Ocean? The rocky Mountains and an inland seaWhat two features formed in north America during the Mesozoic Era? Dinosaurs’ tails were directly below their hips, while reptiles have legs that stick out sideways from their bodiesWhich is a major difference in the build of dinosaurs and reptiles? Mammals, dinosaurs, and reptiles. What existed during the Mesozoic Era? rocks carried by glaciersWhat caused the glacial grooves? MammalsThe Cenozoic era is something known as the age of the______________Across land bridged that are now covers with waterScientist’s believe humans first appeared in Africa. How were they able to make their way to North America? physical changes in speciesChanges in the environment result in____________birdsToday, some scientists think that____________evolved from dinosaurs. mass extinction of land and sea animalsThe end of the Paleozoic Era was signaled by__________Mesozoica life-form that evolved during the____________era was the dinosaur. the environmentPlate tectonics may affect organic evolution because movement of plates may cause a change in_____________two large landmassesPangaea separated intoegg with a strong outer shell that kept it from drying outReptiles evolved from an ancestor of amphibians that developed a___________geologic time scaleThe division of Earth’s history onto smaller units makes up the___________evolveIf a species can adapt to a changing environment, or _____________, its descendants will survive. plate tectonicsThe change in environments that may have occurred at the end of the Paleozoic Era may have been caused by______________Appalachian MountainsThe______________formed during the Paleozoic Era. CenozoicHumans first appeared during the___________Era. AfricaThe oldest fossil remains of human ancestors have been found on the continent of___________marsupialsMost mammals in Australia today are___________PhanerozoicThe Paleozoic, Mesozoic, and Cenozoic eras are all divisions of the____________eon. heavily armoredMany types of fish in the Middle Paleozoic were_____________78Fossil evidence shows that during the mass extinction, _____________ percent of marine-life forms became extinct. hard body partsTrilobites are well represented in the fossil record because of their_______________Reptiles______________can produce on land, while amphibians need water to reproduce. Dinosaurs’ skeletons_______________can be distinguished from those other reptiles by the structure of the hips and legs, Triassic, Jurassic, CretaceousMesozoic Era time periods in orderPaleozoicThe largest mass extinction in earth’s history occurred at the end of the_____________eraclimatePlate tectonics may affect organic evolution because movement of plates may cause a change in ______Theory of Extinctionchanging environmental conditions at the end of the Mesozoic Era led to the disappearance of many kinds of organisms in what may have been a domino effect, as organisms at the base of the food chain were killed, sending waves of extinctions through species higher on the food chain that depended on them. one theory is that a large meteorite crashed into earth 65 million years ago.

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