Just as the total population of illegal immigrants in the U.S. has declined since 2007, the proportion of illegal immigrants in the workforce has also declined; in 2012, illegal immigrants made up 5.1% of the U.S.'s civilian labor force.
Iron Ore is a common ore found almost everywhere in a Minecraft World. Iron ore generates around and below sea-level in the Overworld. It is a crucial material to gather during the early stages of the game, since it can be made into an iron pickaxe capable of mining all types of ores (including diamond). Every Iron Ore block contains enough iron to make one Iron Ingot, when it is smelted.
A worker covers the steel slag poured on the ground with sandy soil at a stainless steel factory. Â­The more advanced way to smelt iron is in a blast furnace. A blast furnace is charged with iron ore, charcoal or coke (coke is charcoal made from coal) and limestone (CaCO3Â­). Huge quantities of air blast in at the bottom of the furnace, and the calcium in the limestone combines with the silicates to form slag.