Which statements are true based on the diagram

What is the approximate circumference of the circle shown below? 12.2 cm

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.

What is the process that powers plate tectonics