Which of the following industries is the largest producer of primary air pollutants in the US?

Chemical plants

Water treatment plants

Power plants

Smelting plants

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 meant by the term relative location?

What was apartheid and how did it restrict the rights of non-whites?