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Geologic History

TermDefinition
index fossil fossils of widely distributed organisms that lived during only one short period
Superposition the principle that in undisturbed rock layers, the oldest rocks are on the bottom
Terrestrial/Jovian Inner Rocky planets/Outer Gas planets
Oxygen O2
half-life length of time required for half of the radioactive atoms in a sample to decay into stable atoms
Carbon-14 radioactive element used to determine the absolute age of remains that were once living and less than 50,000 years old
Accretion the process of growth or increase, typically by the gradual accumulation of additional layers or matter.
Late Heavy Bombardment Period in the solar early solar system when the planets were constantly being struck by asteroids.
Outgassing the process where gases from Earth's interior, primarily from volcanic activity, are released into the atmosphere, which was crucial in forming the planet's early atmosphere and continues to shape it today.
Cyanobacteria They are significant in Earth's history because they were the first organisms to produce oxygen through photosynthesis, which gradually oxygenated the atmosphere and paved the way for the evolution of aerobic life.
Created by: vsimonetti
 

 



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