Geologic Time Crossword Puzzle
Geologic Time crossword puzzle printable. Download, print and start playing. You can add your own words to customize or start creating from scratch.
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QUESTIONS LIST: trace fossil : remains of plants or animals that were very abundant and existed briefly , cyanobacteria : microscopic,photosynthetic prokaryotes , epoch : time unit in the geologic time scale smaller than a period , index fossil : indirect fossil evidence,like footprints,of an organism , cenozoic era : "present" time period , mass extinction : occurs when an unusually large number of organisms disappear from the rock record at the same time , radiocarbon: _ dating - establishing the order of past geographic events , half life : the period of time it takes for one half of a radioactive istope to decay , precambrian : unit of geologic time when earth formed and became hospitable for life , period : third longest time unit in the geologic time scale , radiometric : _ dating - determines the age of a rock or fossil by determining the ration of parent to daughter nuclei , mesozoic era : "middle" time period , paleozoic era : "ancient" time period , era : second longest time in the geologic time scale , relative dating : determines the age of organic objects that were once alive , eon : longest time in the geologic time scale
