245 reported on the synthesis of linear but alsobranched polymers prepared by di-, tri-, and tetra-alkyne andazide monomers like the combination of tripropargylamine(B 3)and(dihydroxymethyl)(diazidomethyl)amine(A 2)(com-pare the general outline in Scheme 17).
When discussing mineral formations in caves, we often talk about stalactites and stalagmites. A stalactite is an icicle-shaped formation that hangs from the ceiling of a cave, and is produced by precipitation of minerals from water dripping through the cave ceiling. Most stalactites have pointed tips.
meteorite - stony or metallic object that is the remains of a meteoroid that has reached the earth's surface. aerolite - a stony meteorite consisting of silicate minerals. meteor, meteoroid - (astronomy) any of the small solid extraterrestrial bodies that hits the earth's atmosphere. micrometeor, micrometeorite, micrometeoroid - a meteorite or meteoroid so small that it drifts down to earth without becoming intensely heated in the atmosphere. pallasite - a meteorite composed principally of olivine and metallic iron. siderite - a meteorite consisting principally of nickel and iron.