Soil solarization. Follow these four steps to solarize your soil: cultivate and remove plant matter; level and smooth the soil; irrigate; and lay a clear tarp on the soil surface for 4 to 8 weeks, depending on local conditions.
Die casting is a manufacturing process that can produce geometrically complex metal parts through the use of reusable molds, called dies. The die casting process involves the use of a furnace, metal, die casting machine, and die. The metal, typically a non-ferrous alloy such as aluminum or zinc, is melted in the furnace and then injected into the dies in the die casting machine.
Except for a few, where in aluminum is used to give light weight to the body. But the main frame work and other parts like pistons, wires, wheel bearings are made of iron. Grey cast iron is used in making engine piston cylinder cases, gear boxes and other tools. While white cast iron is used to make bearings. Again here iron is preferred for its toughness, ability to withstand high temperature of engine etc.