Italy's Valpolicella wine route: top 10 guide. 1  Verona's vineyards, once renowned for churning out basic pizzeria plonk, are now producing some of the country's finest reds. From tastings over home-cooked pasta to stays in an 'agriturismo', here are our key picks for a tasty tour of the region.
bauxite is the color of like dark greenish-blackish.
Topsoils are dark primarily because they contain dead organic material in various stages of decomposition. Some are already dark because of their mineral content. The degradation of organic matter within the soil produces a substance called humus, which has a complex chemical structure and is composed of carbon-rich compounds that impart the dark color. These compounds also interact with the iron and manganese content of the soils.