Precambrian
Paleozoic
Mesozoic
Cenozoic
Practice
100
90%
What % did this era take up of the geologic time scale?
100
Ancient
What is the pre-fix of paleozoic
100
Middle
What is the pre-fix of mesozoic
100
Recent
What is the pre-fix of cenozoic
100
October 3
What is today's date
200
600 Million years
How old was the earth when life began?
200
90%
What % of marine life became extinct during a mass extinction?
200
Jurassic (hint: dinosaurs)
When the dinosaurs become diverse during this era?
200
Mammals
What type of living things rule this era?
300
Sponge
What is the simplest multi-celled animal?
300
invertebrates
What type of animals ruled during this time?
300
Ferns and Cycads
What plants dominated the early Mesozoic?
300
Continents drifted apart
What happened during the Paleogene period?
400
2.4 billion years
When was the ozone layer formed?
400
Rock
What is something we use today from this era?
400
A meter 6 miles in diameter
What made the dinosaurs become extinct?
400
Alps, Rocky Mountains
What mountains were formed during this era?
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