Environmental

In Montana, which type of soil condition is particularly important to identify before building because it expands when wet and can cause significant structural damage to foundations?

ASandy soil
BExpansive or bentonite clay soils✓ Correct
CAlluvial soils near rivers
DVolcanic ash soils

Explanation

Bentonite and other expansive clay soils are found throughout Montana and can expand significantly when wet, exerting pressure on foundations, slabs, and underground utilities. Soil testing before construction and proper foundation design are critical in areas with expansive soils.

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