Environmental

In Colorado, 'expansive soils' (bentonite clay) create a real estate concern because:

AA. They prevent any construction
BB. They expand when wet and shrink when dry, causing foundation movement, cracking, and structural damage to buildings✓ Correct
CC. They are only found in Eastern Colorado
DD. They are a form of groundwater contamination

Explanation

Expansive soils (especially bentonite and other clay soils) are prevalent in Colorado's Front Range and other areas. When these soils absorb moisture, they expand significantly; when they dry, they contract.

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