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Which option gives the most correct small-to-large direction of planet formation?

Answer and explanation

Correct answer: Dust particles, planetesimals, protoplanets, planets

The governing concept is accretion, in which small solid particles collide, stick together, and progressively build larger planetary bodies. Dust grains first gather into planetesimals, which are kilometre-scale building blocks. Continued collisions and gravitational attraction produce protoplanets, and further growth produces planets. Thus option A presents the correct small-to-large sequence. Option B runs the sequence backward. Option C mixes unrelated categories such as a river and a galaxy, so it cannot describe a coherent stage-by-stage formation process. Option D is not a scientific sequence of accretion and also places familiar objects together without showing the physical growth of a planetary body.

Related tags

Planet FormationAccretionPlanetesimalsSolar SystemStar FormationFormation Of PlanetsAnd Our Solar SystemStar Formation Formation Of Planets And Our Solar SystemThe Origin And Evolution Of The EarthGeography

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