This document discusses how climate and rock type impact the rate of weathering. It provides examples of the Hoffman Drainage Tunnel (concrete) and Cleopatra's Needle (granite) and how their appearance has changed over time and location. Specifically, it notes that Cleopatra's Needle, which was constructed in 1500 BC in Alexandria, Egypt and moved to New York City in 1881, shows more weathering in NYC due to the differences in climate between the two locations. It also discusses comparing the weathering of granite and marble gravestones from 1888 and 1885, noting that marble weathers faster.