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Fossils
Study for Test
| Term | Definition |
|---|---|
| Fossil | traces or remains of living things of the past |
| Amber | original remain-tree sap that has trapped an insect or small animal and hardened to become a rock |
| Casts | rock fossil-when a mold fills up with minerals and creates a 3-D model of the organism |
| Carbon Film | rock fossil-a carbon "stamp" of a plant or small animal *able to see the insides of the organism |
| Relative Age | the age of a fossil in "relation" to another fossil (index fossil) or rock layer |
| Pre-Cambrian Time | first segment of time *90% of the Earth"s life |
| Cenozoic Era | the age of mammals *the era we live in |
| Periods | segments of time that make up eras |
| Ice Cores | cylinder samples of ice that can tell us about the past climate and atmospheric gases |
| Jame Hutton | wrote the theory of Uniformitarianism |
| Igneous Rock | rock made by volcanoes |
| Elements | substances made from one type of atom |
| Original Remains | fossils that contain the original parts of the dead organism |
| Tar | original remain-oily, sticky, black material that can trap prehistoric animals |
| Petrified Wood | rock fossil-when minerals enter a dead tree and change it to a rock |
| Law of Superposition | the theory that states that the older rocks are deeper in the Earth than the younger rocks |
| Index fossils | fossils used to find the age of other fossils *common, found throughout the world, found in the same layer of rock |
| Paleozoic Era | the second era of time-age of reptiles |
| Eons | largest segments of time |
| Epochs | smallest segments of time, make up periods |
| Tree Rings | used by scientists to find out what the weather and rainfall was in the past |
| Rock Cycle | the process by which rocks continually change into other rocks *never ends |
| Metamorphic Rock | rocks made by heat and pressure deep inside the earth |
| Compounds | substances made of two or more different types of atoms |
| Ice | original remain-when organisms are frozen in ice |
| Molds | rock fossils-the hollow impression or shape of a dead organism *used to create a cast |
| Trace Fossils | rock fossils-evidence of the organisms' existence *poop, nests, eggs, cave paintings, footprints |
| Sedimentary Rocks | rocks made from sediments being compacted and cemented together |
| Geological Time Scale | a scale that organizes the history of the Earth into intervals of time *each interval is separated by a major event like an extinction |
| Mesozoic Era | era of the dinosaurs |
| Eras | Eons are broken into these time segments |
| Environmental Fossils | fossils that tell us about the past environments and climates *tree rings and ice cores |
| Uniformitarianism | the theory that states: *the Earth is always changing *the same forces that change the Earth today, changed the Earth of the past |
| Minerals | solid substances that make up rocks |
| WED | weathering, erosion, and deposition |
| Mineral ID Tests | color and streak, luster, cleavage and fracture, magnetism, density, acid test, hardness, fluorescence, crystal structure |
Created by:
surfhwy1
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