Stalactites are tapering structures that hang like icicles from the roofs of certain caves.
Stalagmites are mounds or tapering columns that rise up from the cave floor.
Dissolve as much baking soda in each one as you can. You will see tiny stalactites and stalagmites forming in the center of the wool. Stalactites and stalagmites are made from calcium salts dissolved in rainwater that drips slowly from the walls and roofs of caves. The water evaporates as it drips and leaves the dissolved calcium behind to form these natural works of art.