"Or" is a conjunction used to connect two alternates, whether they be alternate ways of phrasing something, "he's a male, or a boy" or different examples, such as the way I just used it.
You will find information on ores on a website that is science orientated. How stuff works is a good place to look for information and they will be able to give you a direct definition of what they are.
No. By definition a rock is made of minerals. An ore is a mineral resource that can be extracted, refined, and sold at a profit.
oil, methane gas, coal, wood, mercury, iron ores, copper ores, zinc ores, lead ores
Extraction of metals from its ores and formation of ores. Studying their properties, their alloys,refining of ores.
Ores.
Their importance is that these ores can be extracted into metals .
Francium hasn't ores; infinitesimal amounts of francium exist in some uranium ores.
ores must be nonrenwable
Metal ores included in this category include: aluminum, antimony, bastnasite, bauxite, beryl, beryllium, cerium, cinnabar, ilmenite, iridium, mercury, microlite, monazite, osmium, palladium, platinum, quicksilver, the rare-earth metals, rhodium.
Someone who specializes in the study of ores would be a mineralogist.
Industries engaged in production or extraction of natural resources such as crops, oil, ores. Read more: http://www.businessdictionary.com/definition/primary-sector.html#ixzz112IQF7CE
No, not all rocks can be referred to as ores. Ores are rocks or minerals that contain sufficient quantity of a sought-after material, like metals, that can be extracted and processed for use. So, while all ores are rocks, not all rocks are considered ores.