GEOLOGY

Detailed explanation-1: -Intrusive igneous rocks weather slowly because it is hard for water to penetrate them. Sedimentary rocks usually weather more easily. For example, limestone dissolves in weak acids like rainwater. Different types of sedimentary rocks can weather differently.

Detailed explanation-2: -Limestone is extremely durable. It does, however, absorb water and, since it is a carbonate rock, it is highly reactive when exposed to acids or even mildly acidic rain water, and it can suffer substantial deterioration. The most common effect of weathering and erosion is loss of precise detail.

Detailed explanation-3: -Clastic or detrital sedimentary rocks are made from pieces of bedrock, sediment, derived primarily by mechanical weathering. Clastic rocks may also include chemically weathered sediment. They are classified by grain shape, grain size, and sorting.

Detailed explanation-4: -Limestone in arid environments tends to be as resistant to weathering and erosion as sandstone, or more so. Limestone, however, has another property unlike sandstone or shale. Limestone is composed mostly of calcite (calcium carbonate) and will dissolve in acidic water.

Detailed explanation-5: -In particular, limestone is weathered by rainwater containing dissolved CO2, (this process is sometimes called carbonation). Hydrolysis-the breakdown of rock by acidic water to produce clay and soluble salts.