In a climate similar to blacksburg, which rock type is most resistant to weathering and will form soil at slower rates - sandstone, limestone, or shale? which one of these rock types is generally least resistant to weathering and will form soil at faster rates? 2) which soil would be best suited for agriculture - a soil formed over sandstone, a soil formed over limestone, or a soil formed over shale? why? 3) if you found a soil in virginia that contained a lot of pyroxene, would you assume this soil is! old or young? would your assumption change if you found a similar soil in antarctica? why?