| igneous rock | produced by fire, great heat, or the action of a volcano; solidified from a molten state. Igneous rock is formed by the cooling and solidification of magma |
| iron ore | The term "iron ore" is used when the rock is sufficiently rich in iron minerals to be mined economically |
| metallurgy | the science or art of metals. It includes the study of their properties and structure, the separation and refining of metals from their ores, the production of alloys, and the shaping and treatment of metals by heat and rolling |
| petrochemical | a chemical made or derived from petroleum or natural gas |
| petroleum | an oily, dark-colored, flammable liquid found in the earth, consisting mainly of a mixture of various hydrocarbons |
| potash | any on of several substances made from various minerals, wood ashes, blast furnace dust, or the like, and used in making soap, fertilizers, and glass |
| soil conservation | preventing soil erosion from water and wind |
| volcano | a cone-shaped hill or mountain around this opening, built up of the material that is forced out |
Drag corresponding items onto each other to make them disappear.
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