Mineral resources are used up.

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.

The ozone hole is at its biggest each year in the ? hemisphere in the ? season.

What is unusual about the iraq mountains ,in spite of their old age?