* Chemical Weathering: Limestone is primarily composed of calcium carbonate (CaCO3). This mineral is highly susceptible to chemical weathering by acids, such as carbonic acid formed when rainwater absorbs carbon dioxide from the atmosphere. This reaction dissolves the limestone, creating features like caves and sinkholes.

* Physical Weathering: Limestone is relatively porous and brittle. This makes it susceptible to physical weathering like frost wedging (water freezing in cracks and expanding), abrasion (being worn down by windblown sand or water), and root wedging (tree roots growing into cracks).

While sedimentary rocks are generally easier to weather than igneous and metamorphic rocks, it's important to note that the specific mineral composition and structure of any rock can influence its weathering rate.

Here's a quick comparison:

* Igneous Rocks: Generally more resistant to weathering due to their dense, crystalline structure. However, some igneous rocks like granite are prone to chemical weathering by acidic rain.

* Metamorphic Rocks: Can be highly resistant due to their recrystallized structure, but their susceptibility to weathering varies depending on the original rock type and the metamorphic process.

Ultimately, the rate of weathering is influenced by a combination of factors, including rock type, climate, and the presence of organisms.