Geologic Time Scale
The geologic time scale is a series of big events or milestones in the earths history.The geologic time scale goes from the begging of Earth till now.It is divided into 4 eras and many periods of time in those eras.
Fossils
Fossils are used as evidence for the geologic time scale by scientists examining the fossils they find.They judge how old they are so they now what kind of plant and wild life belonged to which period of time.That way they not what the Earth was like during that period of time.
Fossils are used as evidence for the geologic time scale by scientists examining the fossils they find.They judge how old they are so they now what kind of plant and wild life belonged to which period of time.That way they not what the Earth was like during that period of time.
When an Era Ends and a New One Begins
The way an era ends an era ends and a new one begins is by a event that changes life on Earth.For example a mass extinction or ice age that causes a complete change in climate,land and plant and wildlife on Earth.Then different animals and plants appear on earth and a new climate thats when a new era begins.
The way an era ends an era ends and a new one begins is by a event that changes life on Earth.For example a mass extinction or ice age that causes a complete change in climate,land and plant and wildlife on Earth.Then different animals and plants appear on earth and a new climate thats when a new era begins.