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Answer:

The shape and size of the particles affect the way that they pack together in a certain amount of space, which affects a rock's porosity. ... But rocks change over time. When enough pressure, or force, is put on a rock, the pressure can make the rock pack its particles closer together.

Explanation:

I looked it up on google.

Answer:

the larger the particles the harder it is to pack the atoms together, however with the help from exterior forces they can be forced together.

Explanation: