Question

which scenario is not an example of physical weathering?
a) ice wedging creating cracks on a sidewalk
b) rusting of metal from oxidation
c) plant roots breaking up concrete
d) abrasion of rocks from blowing sand

Explanation:

Physical weathering involves breaking down rocks or materials without changing their chemical composition. Ice wedging (A), plant roots breaking concrete (C), and abrasion from sand (D) are physical processes. Rusting (B) is oxidation, a chemical reaction (metal + oxygen → metal oxide), so it's chemical weathering, not physical.

Answer:

B) rusting of metal from oxidation