Consider the following facts with regard to geological history of the earth
1. Earth's atmosphere and oceans formed by volcanic activity and out gassing that included water vapor.
2. The origin of the world's oceans was condensation augmented by water and ice delivered by asteroids, proto-planets, and comets.
3. atmospheric "greenhouse gases" kept the oceans from freezing while the newly forming Sun was only at 70% luminosity.
4. By 3.5 billion years ago , the Earth's magnetic field was established, which helped prevent the atmosphere from being stripped away by the solar wind.
Which of the above statement/s is/are true.
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