Principle of radioisotopic dating
Many of the largest mountain ranges and broadest zones of seismic activity come from collisions..
Comparisons of carbon ages with tree-ring data and other data for known events have allowed reliable calibration of the radiocarbon dating method.
Known for the diversification and evolution of life, along with the formation of Pangea.
An atom that has different number of neutrons but the same number of protons.
Relatively chemically inert with a hardness of 8.5.
A stoney and/or metallic object from our solar system which was never incorporated into a planet and has fallen onto Earth.
Meteorite is used for the rock on Earth, meteoroid for the object in space, and meteor as the object travels in Earth's atmosphere.CC BY-SA 3.0], via Wikimedia Commons' src=" alt="The canyon is shown with many layers" width="3600" height="2400" srcset=" sizes="(max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 1362px) 62vw, 840px"/The geologic time scale and basic outline of Earth’s history were worked out long before we had any scientific means of assigning numerical age units, like years, to events of Earth history.