Question

how is mechanical weathering best described?
the buildup of chemical deposits on the surface
the breakdown of rock through decomposition of chemicals
the breakdown of rock through mechanical disintegration and physical stress
the buildup of rock formations over time

Explanation:

Mechanical weathering is about physical processes. The first option is about chemical deposits (not mechanical). The second is chemical decomposition (chemical weathering). The fourth is buildup (not weathering). The third option, breakdown through mechanical disintegration and physical stress, aligns with mechanical weathering.

Answer:

the breakdown of rock through mechanical disintegration and physical stress