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U 5 Earth's History
Earth's Living History
| Question | Answer |
|---|---|
| Fossils help us | understand Earth's history. |
| Ohio fossils are | brachiopod, cephalopod, trilobite, and horsetail plant fossils |
| The remains or traces of a plant or animal that lived long ago. | fossil |
| A model of an organism, formed when sediments fills a mold and hardens. | cast |
| An impression of an organism, formed when sediment hardens around the organism. | mold |
| The science of the forms of life existing in former geologic periods, as represented by their fossils. | paleontology |
| Most fossils are found | in sedimentary rock. |
| What kind of fossil shows how an organism lived? | Trace Fossil |
| Organism that look as if they have not change much over time. | living fossils |
| What happens to living things when they die? | They decompose, wash away, get eaten or get buried |
| Which type of fossil would more closely resemble how an organism looked in life - a mold or a cast? | a cast would more closely resemble how an organism looked. |
| What features of the fossil might help you determine what kind of fossil it is? | Look at its size, shape and parts |
| What might a scientist infer from a plant that has remained unchanged for a long time? | The plant existed in an area that had a very stable environment. |
| A fossil of a type of organism that lived in many places during a relatively short time span. | index fossil |
| A period in which a large number of species become extinct. | mass extinction |
| Long ago, all of Earth's land formed one giant continent. | Pangaea |
| The age of a layer of rock when you compare it to other layers. | Relative age |
| All the fossils in Earth's rock layers containing information about Earth's history and the history of life on Earth. | fossil record |
| Divides earth's history into manageable units. The fossils each unit contains defines that unit. | Geologic Time Scale |
| The largest division of geologic time is an indefinitely long period of time. | Eon |
| A major division of geological time composed of a number of periods and is marked by distinctive character or events. | Era |
| A series of years by which time is measured. | Period |
| Any of several divisions of a geologic period during which a geologic series is formed. A point of time distinguished by a particular event or state of affairs. | Epoch |
Created by:
twaltner
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