Explain, in terms of particle size, why the rock particles are
trapped by the filter paper.
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See explanation

Explanation:

Filtration is the separation of a mixture based on the ability of the molecules of substances to pass through a porous medium that allows only particles less than a certain particle size to pass through it.

Hence, during filtration, particles that are above the limit of particle size that can pass through the filter paper is trapped by the filter paper.

Rock particles are larger than the size of the pores in filter paper, therefore rock particles are trapped by filter paper.