Describe one physical change needed to obtain metal form rock
Answers
Answered by
0
Answer:
Unreactivemetals such as gold are found in the Earth's crust as the uncombined elements. However, most metals are found combined with other elements to form compounds.
An ore is a rock that contains enough of a metal or a metal compound to make extracting the metal worthwhile:
low-grade ores contain a small percentage of the metal or its compound
high-grade ores contain a larger percentage
Most metals are extracted from ores found in the Earth's crust. It is more expensive and wasteful to extract a metal from a low-grade ore, but most high-grade ores have already been used.
Similar questions