Flashcards
Time and the time scale
Cards in this deck (5)
- 1What is relative time?Putting rocks and geological events in sequence of occurrence
(oldest to youngest) - 2What is absolute time?Putting numbers (in years) on rocks and geological events.
- 3What is the age of the Earth?4.54 Ga
- 4The absolute ages of rocks & geologic events are principally determined using what method?Isotopic dating
- 5What is the geologic time scale made of?Eons (Archean - Proterozoic - Phanerozoic)
Eras (of Phanerozoic) - (Paleozoic - Mesozoic - Cenozoic)
Periods - (Cambrian, Ordovoician, Silurian, Devonian)
Epochs (epics) - (In Cenozoic - PEOMPPH)