Term | Definition |
What is another name for the Precambrian Eon? | Before Life |
What is another name for the Paleozoic Era? | Old Life |
What is another name for the Mesozoic Era? | Age of the Reptiles |
What is another name for the Cenozoic Era? | Age of the Mammals |
How long ago was the Precambrian Eon? | 4.6 billion to 543 million years ago |
How long ago was the Paleozoic Era? | 543 million to 248 million years ago |
How long ago was the Mesozoic Era? | 258 million years ago |
What is the Cenozoic Era? | The era we are currently living in |
How long ago was the Cenozoic Era? | 65 million years ago |
When did man first appear? | 500,000 years ago |
What is the largest division of geologic time? | Eon |
What is the second largest division of geologic time? | Era |
What is the third largest division of geologic time? | Period |
What is the smallest division of geologic time? | Epoch |
What type of animals flourished in the Paleozoic Era? | Marine |
How did the Paleozoic Era end? | With a mass extinction the nearly killed 90% of all species |
What happened at the end of the Mesozoic Era? | 15% to 20% of the species became extinct |
What types of animals lived at the end of the Mesozoic Era? | Dinosaurs, small mammals, and birds |
What types of animals lived at the end of the Paleozoic Era? | Amphibians, reptiles, and insects |
What period are we in right now? | Quaternary |