Carbonic acid dissolved in water is a
a.)physical weathering agent c.)biological weathering agent.
b.)chemical weathering agent d.)mechanical weathering agent.

The correct answer is b.) chemical weathering agent.

Carbon dioxide is soluble in water. The carbon dioxide dissolved in water forming carbonic acid. Carbonic acid is a weak acid which dissociate into bicarbonate (HCO₃⁻ ) and carbonate (CO₃⁻ ⁻ ) by losing protons, by this property, carbonic acid reacts with several common minerals. Thus, dissolving carbonic acid in water is a chemical weathering agent.