Geologic Time scale
A geologic time scale is a record of life forms and earths history.
A geologic time scale is a record of life forms and earths history.
Scientist decides when a era ends when there is a mass extinction .
The law of superstition
A general law stating the sequence of the age of sediment rocks, the oldest rocks go on the bottom and the youngest rocks go on the tops fine
A general law stating the sequence of the age of sediment rocks, the oldest rocks go on the bottom and the youngest rocks go on the tops fine
scientist use the fossil record is a record of all fossils and when they were found.