Podcast
Questions and Answers
When did life start on Earth according to the geologic time scale?
When did life start on Earth according to the geologic time scale?
3.5 billion years ago
What were the main life-forms during most of Earth's early history?
What were the main life-forms during most of Earth's early history?
Algae and bacteria
When did complex organisms such as land plants and fish appear?
When did complex organisms such as land plants and fish appear?
Within the last 500 million years
When did humans first appear on Earth?
When did humans first appear on Earth?
How long ago did the Phanerozoic eon begin?
How long ago did the Phanerozoic eon begin?
What is a mass extinction?
What is a mass extinction?
What is a mass extinction?
What is a mass extinction?
What is a catastrophe in the context of Earth's history?
What is a catastrophe in the context of Earth's history?
What event could potentially cause a mass extinction?
What event could potentially cause a mass extinction?
What are the divisions of geologic time after the Proterozoic Eon?
What are the divisions of geologic time after the Proterozoic Eon?
What marks the beginning of the Cambrian period?
What marks the beginning of the Cambrian period?
Which era has the most fossils found by paleontologists?
Which era has the most fossils found by paleontologists?
Flashcards are hidden until you start studying
