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Science Project ch 8
Chapter 8 Project
| Question | Answer |
|---|---|
| Fossil | The remains of an acient organism preserved in rock |
| Carbon Film | A thin coating of carbon left behind by a decayed animal |
| Sedimentary Rock | A type of rock formed when particles of organisms and other rocks are cvemented together |
| Trace Fossil | Things left behind by organisms, which shows what they did |
| Mold | A hollow space where an organism was buried and dissolved |
| Cast | A copy of an oganism's shape |
| Petrified Fossil | A type of fossil where minerals replace all of an organism |
| Paleontoligist | A scientist who studies fossils to learn about ancient organisms |
| Scientific Theory | A well-tested concept that explains a wide range of observations |
| Evolution | The theory that states that organisms change over time |
| Extinct | An organism that has died out |
| Relative Age | The age of a rock compared to rocks around it |
| Absolute Age | The age since a rock formd |
| Law of Superstition | The principle that states that rock layers are younger than thoses below it |
| Extrusion | Igneous rock that has hardened above the surface |
| Intrusion | Igneous rock that has hardened under the surfac |
| Fault` | A break or crack in the Earth's surface |
| Unconformity | Where young rock meets old rock |
| Index Fossil | Fossils of organisms that have lived for a short tine |
| Atom | The smallest particle where the substance is still that substance |
| Element | A substance where all the atoms are the same and cannot be broken down into another substance |
| Radioacive Decay | The process in which a radioactive element releases particles and energy |
| Half-life | The time it takes for half of a radioactive element to decay |
| Geologic Time Scale | The record of geologic events and organisms |
| Era | The three units that divide the time between Precambrian and present |
| Period | The unit of time that divides eras |
| Vertabrate | An animal with a backbone |
| Invertabrate | An animal without a backbone |
| Amphibian | An animal that lives half its life in water and half of its life in land |
| Reptile | A cold-blooded, egg laying vertabrate |
| Mass Extinction | The extinction of several species at the same time |
| Mammal | A warm-blooded vertabrate that feeds their young milk |
Created by:
JinNa
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