boron(A very hard almost colourless crystalline metalloid element that in impure form exists as a brown amorphous powder. It occurs principally in borax and is used in hardening steel)
deciduous forest(The temperate forests comprised of trees that seasonally shed their leaves, located in the east of the USA, in Western Europe from the Alps to Scandinavia, and in the eastern Asia. The hardwood of these forests have been exploited since the 16th century. The trees of deciduous forests usually produce nuts and winged seeds)