Environmental

Expansive soils found in some New Mexico regions can cause significant damage to buildings because:

AThey are too soft to support foundations
BThey shrink and swell with moisture changes, causing foundation movement and cracking✓ Correct
CThey contain high levels of radon
DThey prevent proper drainage

Explanation

Expansive (swelling) clay soils absorb water and expand, then contract when dry. This cyclical movement can crack foundations, walls, and floors. New Mexico's varied geology includes areas with expansive soils.

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