Geologic Time ch. 4.4 17-18

The Geologic Time Scale is a record of what?

• old geologists
• sweet geology music
• the known history of rocks and fossils
• a list of every living thing ever

Paleozoic, Mesozoic & Cenozoic are all

• Epochs
• Eras
• Periods
• Eons

Which is the most recent era of time- the one that we are currently in?

• Mesozoic 
• Paleozoic 
• Cenozoic 
• Precambrian 

Scientists chose where units of geologic time began and ended based on major changes in life forms at certain times.

• true
• false

The dinosaurs and reptiles were dominant in which Era?

• Precambrian
• Mesozoic
• Paleozoic
• Cenozoic

Known as the age of the mammals?

• Mesozoic Era
• Holocene Epoch
• Cenozoic Era
• Cambrian

Which organism first appeared in the Mesozoic?

• Trilobites
• Dinosaurs
• Cyanobacteria
• Humans

Which era are we in now?

• Precambrian
• Mesozoic
• Paleozoic
• Cenozoic

Pangea broke up in the 

• Paleozoic
• Mesozoic
• Archean
• Cenozoic

Which era is the longest?

• Cenozoic
• Cambrian
• Precambrian
• Phanerozoic