<span>ore
An ore is a type of mineral or rock which has a high enough concentration of a desirable element such that it's economical to extract that desired element. This means that the actual concentration of metal in an ore varies quite dramatically depending upon the metal. For instance, Bauxite, which is the ore for aluminum contains approximately 15% to 25% aluminum. But for gold, it's not uncommon to profitably extract 1 ounce of gold from several tons of rock.</span>
Answer:
Between 1830 and 1850, immigrants who moved to American cities often faced crowded living conditions in poor neighborhoods. The Industrial Revolution opened many new job opportunities for people. Americans that lived in the rural areas of the country moved to the larger cities where the factories were located.
643, 000 is the correct answer to your question
Answer:
B. the Caspian Sea
Explanation:
The Caspian Sea borders Central Asia.
