It is commonly called alumina, and may also be called aloxide, aloxite, or alundum depending on particular forms or applications. It commonly occurs in its crystalline polymorphic phase Î±-Al 2 O 3, in which it composes the mineral corundum, varieties of which form the precious gemstones ruby and sapphire.
rain cloud. (meteorology). Any cloud from which rain falls; a popular term having no technical denotation. 1  Facebook. 2  Twitter.
Nimbus means rain so nimbus clouds will be the really darkish ones. These are dark for the reason that they may be carrying a lot of h2o droplets and theyâre willing to give us a shower. The h2o droplets may well arrive out in lots of types of precipitation these types of as rain, snow, hail, and sleet.