Flat roofs usually come with a 10- to 20-year warranty but the roofs can last 25 years if properly installed and maintained. The traditional hot-tar-and-gravel roof is built from three or more plies of waterproof material alternated with hot tar and ballasted by a layer of smooth river stone.
Differences between Spices and Herbs. For the most part, chefs use the terms spices and herbs interchangeably, but there are differences. Spices that originate in tropical or sub-tropical climates and are fragrant or aromatic parts of plants include cinnamon, cloves, ginger, or pepper.
Examples of herbs are basil, parsley, rosemary, thyme and dill. Note that for each of these, we're talking about the green or leafy part of some kind of plant. In the case of basil, the leaves can be quite large, whereas rosemary leaves or more like spines. Still, each is the leafy or green part of the plant and thus an herb.