Stromatolites: You Can't Spell Mold Without Old One of the big problems with Kelvin's estimates for the age of the Earth was ...

Geologic Time is a crucial concept to understanding the history of the earth—including the evolution of life ... We will provide a list of web sites with relevant information. The geologic time scale ...

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.

A Timescale is a scale used to represent periods of time ... Discuss the immense amount of time that the Earth has gone through and the relatively small amount of time many living things especially ...