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Before planets formed, what started the formation of small solid particles in the solar nebula?

Answer and explanation

Correct answer: Cooling and condensation of gaseous matter

The solar nebula consisted mainly of gas and dust surrounding the young Sun. As parts of this nebula cooled, different substances could condense from the gaseous state into tiny solid grains. These grains collided and stuck together through accretion, gradually producing larger particles, planetesimals and eventually planets. Therefore, option A is correct: cooling and condensation provided the initial solid material from which planetary bodies could grow. Ocean waves and mountain erosion are processes on an already formed Earth, and tree growth is a biological process that occurred much later. They cannot explain the first solid particles in the solar nebula. The answer refers to the beginning of planetary formation, not to a later surface process.

Related tags

Solar NebulaCondensationPlanet FormationAccretionStar FormationFormation Of PlanetsAnd Our Solar SystemStar Formation Formation Of Planets And Our Solar SystemThe Origin And Evolution Of The EarthGeography

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