Limestone
80F +
Relative to other rock types, limestone is on the 'easily weathered' end of the scale.
Soil forms more quickly from limestone than from granite. This is due to the composition of limestone that speeds up soil formation.
Since granite is an igneous rock this makes it highly resistant to weathering. Therefore, granite will weather more slowly than limestone.
Chalk would weather fastest, followed by limestone.
Sedimentary rocks would weather the fastest, especially ones like limestone, because it's made mostly from calcium carbonate, which is easily dissolved by the slightly acidic rainwater.
yes
From what I know, limestone is alkali, and high pH water would not weather alkali things. For the case of limestone, it might even make the limestone bigger (think so).
Limestone
Quicklime reacts with water, limestone doesn't. That's probably the fastest way.
The type of climate that a limestone will weather more quickly i think will be a hot and dry climate.
limestone
80F +
Because rainwater is mildly acidic. Acid in the rainwater dissolves the limestone.
Relative to other rock types, limestone is on the 'easily weathered' end of the scale.
They start to weather away. Acid rain is a huge contributor to the weathering of Limestone structures.