8th Grade Science Clues to Earth's Past
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| PALEONTOLOGIST | SCIENTISTS WHO STUDY FOSSILS
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| FOSSIL | THE REMAINS, IMPRINTS, OR TRACES OF PREHISTORIC ORGANISMS PRESERVED IN ROCK.
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| PERMINERALIZED | FOSSILS IN WHICH THE SPACES INSIDE ARE FILLED WITH MINERALS FROM GROUNDWATER.
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| CARBONACEOUS FILM | A THIN FILM OF CARBON RESIDUE FORMING A SILHOUETTE OF THE ORIGINAL ORGANISM.
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| MOLD | A FOSSIL FORMED AS A CAVITY IN A ROCK.
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| CAST | A COPY OF THE ORIGINAL OBJECT FORMED WHEN SEDIMENTS FILL A MOLD AND HARDEN.
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| TRACE FOSSILS | FOSSILIZED TRACKS AND OTHER EVIDENCE OF THE ACTIVITY OF ORGANISMS.
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| 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.
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| PRINCIPLE OF SUPERPOSITION | IN UNDISTURBED ROCK LAYERS, THE OLDEST ROCKS ARE ON THE BOTTOM AND THE YOUNGEST ROCKS ARE ON THE TOP.
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| RELATIVE DATING | DETERMINES THE ORDER OF EVENTS AND RELATIVE AGE OF ROCKS BY EXAMINING THE POSITION OF ROCKS IN A SEQUENCE.
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| UNCONFORMITIES | GAPS IN THE ROCK LAYERS DUE TO EROSION, NONDEPOSITION, OR BOTH
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| ABSOLUTE DATING | USES THE PROPERTIES OF ATOMS IN ROCKS AND OTHER OBJECTS TO DETERMINE THEIR EXACT AGES.
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| RADIOACTIVE DECAY | ELEMENT THAT GIVES OFF RADIATION DUE TO AN UNSTABLE NUCLEUS.
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| HALF-LIFE | TIME IT TAKES FOR HALF THE ATOMS IN A RADIOACTIVE ISOTOPE TO DECAY.
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| 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.
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| UNIFORMITARIANISM | STATES THAT EARTH PROCESSES HAPPENING TODAY ARE SIMILAR TO THOSE THAT HAPPENED IN THE PAST.
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| PETRIFIED | FOSSIL REMAINS THAT FORMED WHEN SOME OR ALL OF THE ORIGINAL ORGANISM IS REPLACED WITH MINERALS.
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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Created by:
smurray817
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