1. absolute dating
2. eon
3. era
4. geologic time
5. geologic timeline
6. half-life
7. mass extinction event.
8. period
9. radioactive decay
10. relative dating
the process of determining the
order of events in geologic time
a major division of geologic time
that is a subdivision of an eon
the period of time covering the
physical formation and development of
the earth
a division of geologic time and a
subdivision of an era
the extinction of a large number of
species in a short period of time that is
usually caused by a catastrophic global
event like an asteroid
process of determining a specific
date of an object
the longest unit of geological time
the time required for half the atoms
in an element to divide in half
the process by which an unstable
nucleus of an atom spontaneously
releases energy through the emission of
radiation used in dating fossils and rocks
a visualization of how the earth and
its lifeforms have changed through
geologic time