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8 Sci Ch 7

8th Grade Science Clues to Earth's Past

QuestionAnswer
PALEONTOLOGIST SCIENTISTS WHO STUDY FOSSILS
FOSSIL THE REMAINS, IMPRINTS, OR TRACES OF PREHISTORIC ORGANISMS PRESERVED IN ROCK.
PERMINERALIZED FOSSILS IN WHICH THE SPACES INSIDE ARE FILLED WITH MINERALS FROM GROUNDWATER.
CARBONACEOUS FILM A THIN FILM OF CARBON RESIDUE FORMING A SILHOUETTE OF THE ORIGINAL ORGANISM.
MOLD A FOSSIL FORMED AS A CAVITY IN A ROCK.
CAST A COPY OF THE ORIGINAL OBJECT FORMED WHEN SEDIMENTS FILL A MOLD AND HARDEN.
TRACE FOSSILS FOSSILIZED TRACKS AND OTHER EVIDENCE OF THE ACTIVITY OF ORGANISMS.
INDEX FOSSILS THE REMAINS OF SPECIES THAT EXISTED ON EARTH FOR RELATIVELY SHORT PERIODS OF TIME, USED BY SCIENTISTS TO DETERMINE THE AGE OF ROCK LAYERS.
PRINCIPLE OF SUPERPOSITION IN UNDISTURBED ROCK LAYERS, THE OLDEST ROCKS ARE ON THE BOTTOM AND THE YOUNGEST ROCKS ARE ON THE TOP.
RELATIVE DATING DETERMINES THE ORDER OF EVENTS AND RELATIVE AGE OF ROCKS BY EXAMINING THE POSITION OF ROCKS IN A SEQUENCE.
UNCONFORMITIES GAPS IN THE ROCK LAYERS DUE TO EROSION, NONDEPOSITION, OR BOTH
ABSOLUTE DATING USES THE PROPERTIES OF ATOMS IN ROCKS AND OTHER OBJECTS TO DETERMINE THEIR EXACT AGES.
RADIOACTIVE DECAY ELEMENT THAT GIVES OFF RADIATION DUE TO AN UNSTABLE NUCLEUS.
HALF-LIFE TIME IT TAKES FOR HALF THE ATOMS IN A RADIOACTIVE ISOTOPE TO DECAY.
RADIOMETRIC DATING DETERMINES THE ABSOLUTE AGES OF ROCKS BY MEASURING THE AMOUNTS OF PARENT AND DAUGHTER MATERIALS IN A ROCK AND BY KNOWING THE HALF-LIFE OF THE PARENT.
UNIFORMITARIANISM STATES THAT EARTH PROCESSES HAPPENING TODAY ARE SIMILAR TO THOSE THAT HAPPENED IN THE PAST.
PETRIFIED FOSSIL REMAINS THAT FORMED WHEN SOME OR ALL OF THE ORIGINAL ORGANISM IS REPLACED WITH MINERALS.
Created by: smurray817 on 2010-12-08



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