In what Eon did life ON LAND begin? Hadean false Archean false Proterozoic false Phanerozoic true Single The Pre-Cambrian is a very large section of total geologic time. There are 3 eons lumped together in the pre-cambrium. Which of the following is the correct 3? Hadean, Archean, Proterozoic true Cenozoic, Mesozoic, Paleozoic false false false Single What Eon of the Earth has no records left for us to study? Hadean true Archean false Proterozoic false Phanerozoic false Single this eon multicellular life was created. During this eon the Earth was considered the Snowball Earth and the Oxygen Catastrophe occurred causing loss of oxygen on our Earth. This eon is also the 3rd eon in Earth’s history. Which eon is this? Archean false Hadean false Proterozoic true Phanerozoic false Single The moon formed during this eon, this eon occurred before life and before the crust had solidified. Hadean true Archean false Proterozoic false Phanerozoic false Single How are periods, eras, and eons related? Periods are the building blocks of all time. Two or more periods form an era. Two or more eras form a eon. true Eras are the building blocks of all time. Two or more eras form an eon. Two or more eons form a period. false Eons are the building blocks of all time. Two or more eons form a era. Two or more eras form a period. false false Single During which Eon did 96% of marine species as well as a similar amount of land animals perish that could’ve been caused by volcanic eruptions? (Hint: Called "The Great Dying") Hadean false Archean false Proterozoic false Phanerozoic true Single What is the difference between the Precambrian and Cambrian time periods? Multicellular life formed at the start of the Cambrian time period. true Multicellular life formed at the start of the Precambrian time period. false There is no difference between the time periods. false There is no Cambrian or Precambrian time period. false Single What most limits the study of the previous eons? Scientists can't time travel. false Due to mass extinctions, some species that we could've studied had gone extinct. false No evidence of previous eons are written down. false The rock cycle destroys evidence of the previous eons limiting our study of previous eons. true Single What Era do we currently live in? Jurassic false Cenozoic true Mesozoic false Paleogene false Single