Earth was extremely hot after it formed. There were three likely sources of this heat: Earth's gravitational contraction, radioactivity, and bombardment by asteroids, meteorites, and other system bodies.
Hydrothermal energy was not a source of heat for early earth.
What was early earth?
- The Earth, along with the other planets in our solar system, originated more than 4 billion years ago.
- The early Earth had no ozone layer and was most likely quite hot. There was also no free oxygen on the early Earth.
- Few things could have survived on the early Earth without an oxygen environment. Anaerobic bacteria were most likely the first living organisms on Earth.
- The early Earth had no seas and was constantly bombarded by meteors and asteroids. Volcanic outbursts were also common. Volcanic eruptions emitted water vapor, which cooled to form the seas.
- As solar radiation broke water molecules and cyanobacteria began photosynthesis, the atmosphere gradually became increasingly oxygen-rich. Eventually, the atmosphere evolved into what it is now, which is oxygen-rich.
- Around 2 billion years ago, the first sophisticated species appeared on Earth.
Thus, we can conclude that Option B is correct.
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