It is a geological period ... happening to the biosphere, human beings are doing it and it's happening on a massive scale. I don't have to waste time proving when it happened, when it started ...

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 ...

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.

Looked at another way, if one were to measure our planet's age as a single 24-hour day, the first human civilizations would appear less than a second before midnight. The geological time scale ...

Have human beings permanently ... to the International Union of Geological Sciences (IUGS), the professional organization in charge of defining Earth’s time scale, we are officially in the ...

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 ...

We will provide a list of web sites with relevant information. The geologic time scale is divided into eons, eras, periods, epochs, and ages. Our activities, and the time scale for download above, ...