From where did the oxygen in the Earth's atmosphere originate?

A) photosynthesis from plant life and single-celled organisms
B) atmospheric bombardment
C) outgassing from volcanoes
D) chemical reactions between gas in the upper atmosphere and the solar wind
E) oxidation of surface rocks


A

Physics & Space Science

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Weight and g: In another solar system, a planet has an airless moon Zygo that is 4.0 × 105 m in diameter. Experiments reveal that a freely falling object at the surface of Zygo accelerates at 0.20 m/s2. What is the mass of Zygo? (G = 6.67 × 10-11 N ? m2/kg2)

A. 2.4 × 1019 kg B. 4.8 × 1019 kg C. 1.2 × 1020 kg D. 2.4 × 1020 kg E. 4.8 × 1020 kg

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Physics & Space Science

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What will be an ideal response?

Physics & Space Science