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Questions and Answers
When did the earliest known life forms on Earth originate?
When did the earliest known life forms on Earth originate?
- 4.28 billion years ago
- 4.5 billion years ago
- 3.77 billion years ago
- 3.42 billion years ago (correct)
Where is the earliest direct evidence of life on Earth found?
Where is the earliest direct evidence of life on Earth found?
- Australian Apex chert rocks (correct)
- Ocean floor sediments
- Siberian permafrost
- Hydrothermal vents
What is the extent of Earth's biosphere into the atmosphere?
What is the extent of Earth's biosphere into the atmosphere?
- At least 76 km (47 mi) (correct)
- Up to 50 km (31 mi)
- At least 100 km (62 mi)
- Up to 30 km (18 mi)
How old are the oceans on Earth?
How old are the oceans on Earth?
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What is debated about the microfossils found in Australian Apex chert rocks?
What is debated about the microfossils found in Australian Apex chert rocks?
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