What do we call the process by which rocks wear down and break apart into smaller pieces?

Weathering

Explanation:

You can get confused with weathering and erosion. erosion is when rock is weathered down and the particles or sediments are taken away, to maybe for example create sand dunes.

When rock is broken down into pieces or worn down, this is called physical weathering.

There are many ways the get physical weathering. One of the most common is frost wedging, in which water freezes and expands, cracking the crack into smaller pieces.

Therefore, Weathering will be the right answer for a process by which rocks wear down and break apart into smaller pieces.

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the potential energy of the reactants is 200j.

from the energy diagram, the energy of the product formed is 350j; this means that, this reaction is an endothermic reaction, because it absorbs energy from its environment.