6th grade geography plz help for 10 points

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.

Political boundaries are determined by the political party in control at the time. true or false

The amazon river is in africa true or false