The deserts runs through west and central africa it stretches from the atlantic to the ocean farmers here use agricultre and move to another area when soil nutrients are used up

Witch one is it soo it the the question b.a,b,c,d

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.

Explain why the rate of urbanisation is in the way it is between developed and undeveloped countries.