What is the Geologic Time Scale?
The Geologic Time Scale is the study of Earth from the beginning of time to present day. It is an important vertical timeline, and it records Earths ancient life, climates, and geography.
How do scientists decide when one era ends?
Scientists decide when one era ends when by using major changes in life forms at certain times.
Scientists decide when one era ends when by using major changes in life forms at certain times.
Other Interesting Facts
The Earths history, if put in a book, would be 145 miles long. To record relative time, scientists use rocks. They use radiometric dating to find absolute days.
The Earths history, if put in a book, would be 145 miles long. To record relative time, scientists use rocks. They use radiometric dating to find absolute days.
The Law of Superposition
The Law of Superposition states that in horizontal sedimentary rock layers, the oldest layer is on the bottom. Each higher layer is younger than the one below it.
The Law of Superposition states that in horizontal sedimentary rock layers, the oldest layer is on the bottom. Each higher layer is younger than the one below it.
How the Fossil Record is Used By Scientists
The fossil record is used by scientists as evidence to support The Theory of Evolution.
The fossil record is used by scientists as evidence to support The Theory of Evolution.