How do we know this and how do we know the ages of other events in Earth history?
______________ is the general process whereby an unstable atomic nucleus is spontaneously transformed? “Spirit Stuff” 14) Physical laws are the same today as in the past?
A) 2 million years old B) 3.96 million years old C) 3.96 billion years old D) No one is sure.
A) Seasoning B) Scum C) Residue D) Layer 10) The oldest rock is how old?
Actually, each unit of the Time chart was developed only as early geologists identified the layers of rock and the fossils captured within them.
As shown in the image above of the Grand Canyon, each layer of rock needed to be studied, researched, identified, and named in order for geologists to devise the Geologic Time Chart.