Oxygen most likely accumulated in the atmosphere very gradually after the appearance of photosynthetic organisms, which consume carbon dioxide while manufacturing oxygen.
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Q56: There is direct geologic evidence about Earth's
Q57: Which planets contain mostly hydrogen atmospheres?
A) Mercury,
Q58: Which of the following are the correct
Q59: The largest reservoir of water on, below
Q60: Differentiation of planetary embryos results in denser
Q62: The final accretion of Earth is thought
Q63: How did the hydrosphere and atmosphere form?
Q64: The disk-shaped cloud that formed our solar
Q65: Explain the origin of oceanic crust.
Q66: A planet is a celestial body that
A)
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