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8Sci_EarthInFossils
The History of the Earth in Fossils, Ice Cores and Rocks (Tabat-2014)
| Question | Answer |
|---|---|
| What part of Earth's history is shown by the analysis of ice cores? | Changes in climate |
| What method do paleontologists use to determine the forms of life that existed millions of years ago? | They examine fossils records |
| If a complete skeleton of a bird is found that can't be identified, what can be determined about the bird from this fossil? | The bird existed at one time but is now extinct |
| How can you explain why several fossils of sea organisms were discovered buried deep in an area of dry land? | The land was once underwater |
| What era is known as the "Age of Mammals?" | Cenozoic era |
| If a researcher hypothesizes that the area was inhabited by small rodents. What would make him change his hypothesis? | If he found fossils of marine organisms |
| What type of rock replaces bone and other hard organic materials to create rock molds of fossils? | Sedimentary rock |
| What can be determined if you are studying a layer of rock containing fossils without the surrounding layers? | The organisms that lived together during this time period |
| What can be gained by studying the fossilized tooth of a Megalodon shark? | The differences from teeth of living sharks |
| How can ice cores provide scientists with evidence for climate change over a period of time? | The concentration of gases in the ice core indicate colder or warmer temperatures |
| How can scientists conclude that a forested ecosystem existed in Antarctica millions of years ago? | The fossil record |
| Why are index fossils used as guides to determine the age of rocks? | Each index fossil lived during a specific geologic time period |
| In the fossil record, what conditions could be a reason for mass extinction? | Falling sea levels and global cooling |
| Why are fossils most likely found in sedimentary rock samples? | Sedimentary rocks are formed in layers that trap the material for fossilization |
| What are fossils an indicator of? | Ancient environmental conditions |
| What do scientists study when investigating environmental changes over millions of years? | The fossil records |
| What is the best evidence that the environment of Earth has changed over millions of years? | Marine fossils found in the mountains |
| If Paleontologists construct a model of a dinosaur from its bones and teeth what can they determine about this dinosaur? | Height of the dinosaur, length of the dinosaur and the type of food the dinosaur ate |
| If a paleontologist finds similar reptiles in the same rock layers in a cliff and none in the rocks above. What will this tell him about these reptiles? | The reptiles either evolved into a new species or went extinct |
| What chemical compound is present in an ice core sample? | Carbon dioxide |
| What type of rock contains index fossils? | Sedimentary |
| What would most likely cause rock layers with seashells being found on top of a mountain higher than sea level? | Faulting |
| How can scientists best determine when an ancient species became extinct? | By organizing the rock layers in which the fossils were found |
| How are trilobite fossils helpful in understanding the distribution of living things throughout Earth's history? | Trilobites were found worldwide and are signature creatures of the Paleozoic Era |
| Why would scientists want to analyze the air trapped in an ice core? | To learn how the atmosphere changed over time |
| What does it indicate about the ages of the rocks when a scientist finds an index fossil in layers of rock in both Africa and South America? | The rocks are approximately the same age |
| What characteristic of an extinct organism makes it best suited to be used as an index fossil? | An organism that was commonly fossilized during a specific period of time |
| What does the presence of snail fossils that once thrived in savannahs approximately 130,000 years ago indicate when found in areas of Egypt that are now deserts? | There was more humidity in the air 130,000 years ago in that area |
| Which carbon dioxide level preserved in an ice core has the highest concentration of CO2? 200 ppm CO2? 250 ppm CO2? 300 ppm CO2? Or 350 ppm CO2? | 350 ppm CO2 |
| If the Cenozoic Era is known as "Age of Recent Life," the Mesozoic Era is known as "Age of Medieval Life," and the Paleozoic Era is known as the "Age of Ancient Life" which era would be the oldest? | The Paleozoic Era |
| Studies have shown that levels of CO2 levels have increased and decreased over the last 400,000 years. What can be inferred about global temperatures over the same time period? | Temperatures have risen and dropped in a repeated pattern over the time period |
Created by:
masonteach
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