Examlex
During the 1920s and after, the constancy with which same-age children were brought together in graded school classes, sports, and clubs
Geologic Time
The exceptionally long period of time dealt with by geology; the time extending from the formation of Earth to the beginning of written history.
Precambrian
The long span of time before the Phanerozoic Eon, making up around 88% of Earth's history, marked by the formation of the earth and early life forms.
Geologic Timescale
A system of chronological dating that relates geological strata to time, used by geologists, paleontologists, and other Earth scientists to describe the timing and relationships of events in geologic history.
Ecosystems
Communities of living organisms and their physical environment interacting as an integrated system.
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