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Iron
Beginning of essay
in its pure state is soft, malleable and ductile (that can be
stretched, drawn or hammered thin without breaking ((Webster's Dictionary, 419,
1988)) with a hardness of 4-5. It is easily magnetized at room temperatures and
this property disappears when heated above 790 degrees Celsius.. Metal
oc ....
Middle of essay
....st method special machines that detects the
iron's magnetism are used ti find a deposit. In the second method a plane with
special equipment flies over an area of land suspected of having ore deposits
and shoots down sound waves to determine if that area contains iron deposit.
The waves come back up to the plane and determined by the pattern one can tell
if there is an iron deposit.
In the early 1990's annual production of iron ore in the United State
exceeded 56 million metric tons (Encarta,.... |
| Number of words: 1056 |
Approximate pages: 4 |
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