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Science 8 Geohistory
Covers NC Science 8 standards for 8.E.2
| Question | Answer |
|---|---|
| What are fossils? | preserved remains or traces of living things |
| What is sedimentary rock? | rock made from hardened sediment |
| What is a mold? | a hollow area of sediment in the shape of an organism or part of an organism |
| What is a cast? | a solid copy of the shape of an organism |
| What are petrified fossils? | when minerals replace some or all of an organism in a fossil |
| What is carbon film? | a very thin carbon coating on a rock |
| What is a trace fossil? | a fossil that provides evidence of the activities of ancient organisms |
| What is a paleontologist? | a scientist who studies fossils |
| What is a scientific theory? | a well-tested concept that explains a wide range of observations |
| What is evolution? | the gradual change in living things over long periods of time |
| What does it mean if an organism is extinct? | when an organism no longer exists and will never again live on Earth |
| What is a rock's relative age? | a rock is its age compared to the ages of other rocks |
| What is a rock's relative age? | the number of years since a rock formed |
| What is the Law of Superposition? | the geologic principle that states that in horizontal layers of sedimentary rock, each layer is older than the layer above it and younger than the layer below it |
| What is extrusion? | lava that hardens on the surface |
| What is intrusion? | an igneous rock layer that forms when it hardens under the surface |
| What is a fault? | A break in the Earth's surface |
| What is an unconformity? | the surface where new rock layers meet a much older rock surface beneath them |
| What is an index fossil? | fossils of widely distributed organisms that lived during only one short period |
| What are periods? | one of the units of geologic time into which geologists divide eras |
| What is an era? | one of the three long units of geologic time between the Precambrian and the present |
| What was the Cenozoic era? | when mammals became common |
| What was the Mesozoic era? | age of reptiles |
| What was the Paleozoic era? | the earliest era |
| What is continental drift? | the movement of the Earth's surface because of forces inside Earth |
| What was Pangaea? | a supercontinent that was theoretically a combination of all of our current continents |
| What is a mass extinction? | where many types of living things become extinct at the same time |
| When did the earliest forms of life appear? | Precambrian Time |
| Most fossils form when organisms die and are buried in what? | Sedimentary rock |
| Which era is often called the Age of Reptiles? | Mesozoic era |
| Organisms that spend part of their lives in water and part on land are called what? | amphibians |
| What are mammals? | warm-blooded vertebrates which feed milk to their young |
| What occurred at the end of the Cretaceous Period? | Mass extinction |
| What are animals without backbones called? | Vertebrates |
| Humans appeared in what era? | Cenozoic Era |
Created by:
Alia Cherrywood
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