Geologic Time is a crucial concept to understanding the history of the earth—including the evolution of life. Many different representations ... The geologic time scale is divided into eons, eras, ...

The geological time scale, established by scientists in the ... The scale functions as a massive calendar, dividing the history of life into eras, periods, and epochs based on fossil evidence.

Prehistoric time line, geologic time scale, photos, facts, maps, and more from National Geographic. Humans have walked the Earth for 190,000 years, a mere blip in Earth's 4.5-billion-year history.

There is little dispute within the scientific community that humans are changing Earth's climate on a decadal to century time-scale. By the end of this century ... underdeveloped potential of the deep ...

I like to use a meter stick and be very intentional with my spacing to model time as a scale. I also avoid using the far right ... of the Earth that is characteristic of a particular span of geologic ...