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Questions and Answers
What is the estimated time of formation of Earth and the other planets in the solar system?
What is the estimated time of formation of Earth and the other planets in the solar system?
- 4.6 billion years ago (correct)
- 5.5 billion years ago
- 3.5 billion years ago
- 2.5 billion years ago
What likely occurred to the water vapour in the first atmosphere as Earth cooled down?
What likely occurred to the water vapour in the first atmosphere as Earth cooled down?
- It turned into a thick fog
- It condensed into the ocean (correct)
- It disappeared into space
- It turned into a solid
What is believed to have favoured the synthesis of organic molecules essential for the origin of life?
What is believed to have favoured the synthesis of organic molecules essential for the origin of life?
- Only the Earth's reducing atmosphere
- Only volcanic eruptions and lightning
- Volcanic eruptions, lightning, extreme UV radiation, hydrothermal vents, and alkaline vents along with the Earth's reducing atmosphere (correct)
- Only extreme UV radiation and hydrothermal vents
What is the approximate age of the fossils of micro-organisms that provide direct evidence for life on early Earth?
What is the approximate age of the fossils of micro-organisms that provide direct evidence for life on early Earth?
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What was the characteristic of the first atmosphere on Earth?
What was the characteristic of the first atmosphere on Earth?
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What is the process by which simple organic molecules formed macromolecules such as proteins and nucleic acids?
What is the process by which simple organic molecules formed macromolecules such as proteins and nucleic acids?
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