coal: a combustible black or dark brown rock consisting mainly of carbonized plant matter, found mainly in underground deposits and widely used as fuel.

silk:a fine, strong, soft lustrous fibre produced by silkworms in making cocoons and collected to make thread and fabric. Silk is also spun by some insect larvae and by most spiders

sunlight: light from the sun.

iron: a strong, hard magnetic silvery-gray metal, the chemical element of atomic number 26, much used as a material for construction and manufacturing, especially in the form of steel.

wheat: a cereal plant that is the most important kind grown in temperate countries, the grain of which is ground to make flour for bread, pasta, pastry, etc.

timber :wood prepared for use in building and carpentry

gem: a precious or semiprecious stone, especially when cut and polished or engraved.

leather: a material made from the skin of an animal by tanning or a similar process.

wool: the fine, soft curly or wavy hair forming the coat of a sheep, goat, or similar animal, especially when shorn and prepared for use in making cloth or yarn.

honey: a sweet, sticky yellowish-brown fluid made by bees and other insects from nectar collected from flowers.

Squash: The winter squash is an annual fruit that represents several species of squash in the genus Cucurbita.

crude oil:unrefined petroleum.

mineral products: Mineral Products means things produced and prepared in a marketable state by simple treatment processes such as washing or drying