Discussion
A natural colloidal clay, having the characteristics of absorbing water and swelling 8 to 15 times its dry size, used as an efficient and effective sealing material for farm ponds, is
Answer: C
The material is bentonite.
Bentonite is a natural clay made mostly of sodium montmorillonite. Its plate-like colloidal particles absorb water between their layers and swell to many times their dry volume, roughly 8 to 15 times, filling the soil pores. Mixed into the bed and sides of a farm pond, it forms a tight, low-permeability seal against seepage.
EPDM and butyl are synthetic rubber sheets used as pond liners, not natural clays. Soil cement is a mixture of soil and Portland cement that hardens into a lining; it does not swell on wetting.
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