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Which combination best explains early Earth remaining hot for a long time?

Answer and explanation

Correct answer: Impacts radioactive heat and gravitational compression

The direct answer is Option B: impacts, radioactive heat, and gravitational compression. Early Earth became hot through several connected processes. Repeated collisions of planetesimals converted motion energy into heat. As material collected under gravity, gravitational compression also produced heat. In addition, radioactive elements inside the young Earth released energy as they decayed. These sources together explain why the planet remained hot for a long time and why parts of it melted and separated into layers. Option A is wrong because solar wind and cold rainfall do not provide the main internal heat explanation. Option C is wrong because vegetation and rivers appeared much later and cannot explain the early molten Earth. Option D is wrong because ozone and modern air were not present as modern conditions at that stage. Memory cue: early Earth’s heat came from impacts, compression, and radioactivity.

Related tags

Early HeatRadioactive HeatGravitational Compression

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