Usually "he has found it," would signify a recent occurrence, a positive action, or more emotion. Where as "he found it," could be a negative result, or the completion of a troublesome search. Thank...
Copper is found as Copper ore in rocks. Incorrect!Co is the symbol for cobalt, not copper. Copper is Cu. The greatest reserves of cobalt is found in Africa, mostly Zambia and The Congo. The form...