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Describe the use of nulls in a database.
Rounded Cobbles
Naturally smoothed and rounded small rocks, typically found in riverbeds or beaches, formed by the action of water.
Permeability
A measure of the ability of a material to transmit a fluid.
Natural Cement
A type of cement that naturally forms from the chemical reaction of limestone with clay minerals under specific conditions.
Pores
Small openings on a surface, which allow for the passage of gases, liquids, or microscopic particles.
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