When is a rock considered an ore choose all that apply?

Witch layer of the atmosphere has the most air pressure

Which statement explains what upwelling causes? a. upwelling causes tides to rise and fall. b. upwelling causes changes in the direction of currents. c. upwelling causes nutrients, minerals, and tiny organisms to rise. d. upwelling causes currents in the pacific ocean to change direction. i think the answer is c.

Unlike other andean nations, chile has a relatively small population of mestizos people of european descent indians people of asian descent