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Stack #3682640
| Question | Answer |
|---|---|
| How do glaciers acquire their load of sediment? | Sediments and rocks are plucked off the ground surface at the base and sides of the glacier. |
| It shows ice sheets covering Greenland and Antarctica. Why are ice sheets primarily found in these regions? | they are the coldest regions of the globe |
| The Colorado River still has water after it leaves the desert southwest region and enters the Gulf of California because ________ | the river began outside the desert, which is normally the only way streams that leave the desert will still have water in them |
| . Which of the following statements concerning the strata is true? | beds 1 and 3 are older than bed 4 |
| Unconformities that represent a break in the geologic record of deposition are geologically significant ________. | they represent a period of erosion in the region |
| The ________ is the idea or concept that ancient life forms succeeded each other in a definite, evolutionary pattern and that the contained assemblage of fossils can determine geologic ages of strata. | principle of fossil succession |
| Which of the following denotes the divisions of the geologic time scale in correct order of decreasing lengths of time beginning with the longest time interval and ending with the shortest? | eon, era, period, epoch |
| The era known as the "age of mammals" is the ________ era. | Cenozoic |
| The principle of cross-cutting relationships which states that a geologic feature that cuts across another feature must be younger than the feature it cuts is important because ________. | it provided a tool for sorting out the relative timing of various geologic events |
| A major difference between Catastrophism and Uniformitarianism is ________. | catastrophism supports rapid changes on the earth and a young age of Earth while Uniformitarianism requires long times for changes to be significant and thus a very old earth |
| The subdivision of the geologic time scale that represents the longest time span is called a(n) ________. | eon |
| The principle of horizontality which states that sediments are usually deposited in relatively flat layers is important because ________. | it provided a way to recognize if rocks had been deformed |
| Paleontology is the study of ________. | ancient life |
| About 88 percent of geologic time is represented by the time span called the ________ era. | precambrian |
| One of the primary goals of geology is to ________. | understand the history of Earth |
| The principle of superposition which states that in undeformed rocks, the younger rocks will be on top of older rocks, is particularly important because ________. | it provided an order for assembling the relative ages of various rock layers |
| The principle of lateral continuity proposes that sedimentary rock layers continue in all directions until they grade into a different rock type or thin out on the edge of a basin is important because ________. | it allowed geologists to correlate sedimentary rock units over large distances |
| In the late 1800's various principles (original horizontality, inclusions, cross cutting relations, etc. arête) were established and used to ________. | organize the order in which events occurred on Earth |
| The Goldilocks scenario suggests that ________. | we are very fortunate to be in the right place in the universe and to have had the right condition to develop and sustain life |
| The Cenozoic era is often called the "age of ________." | mammals |
| In the early history of Earth, the solid surface of the earth weathered more rapidly than now because ________. | the early rain was very acidic |
| At the start of the Paleozoic, North America ________ | had no plants or animals |
| The dominant life forms during the Cenozoic Era were ________. | mammals and angiosperms |
| Which era is sometimes called the "age of dinosaurs"? | Mesozoic |
| The largest mass extinction in the Phanerozoic occurred in the ________. | permian |
| Earth's primitive atmosphere evolved from gases ________. | expelled from within the earth |
| Which one of the following represents the greatest expanse of geological time? | Precambrian |
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khoseid