why would a radioactive element need to have a known rate of decay in order for it to be useful as a dating tool?

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 weather system might be occurring if the pressure gradient decreases and fish harvests in peru are weaker than normal

Select the word from the list that best fits the definition a mountain range in northeast central asia answer is altay shan