List two kinds of damaged caused by acid rain in Washington DC

Damage to buildings and certain memorials.

Explanation: When acids in polluted air react with calcite, a calcium-containing mineral in marble and limestone, the calcite dissolves. In exposed areas of buildings and statues, acid rain effects show up as roughened surfaces instead of smooth ones, as pits and pocks where material was removed, and as a loss of carved details. Stone surface material may be lost all over or only in spots that are more reactive. The loss of silicate mineral inclusions in the marble columns as the calcite matrix holding them together is dissolving the marble around the Thomas Jefferson memorial.