If a rock has 500 atoms of a parent and 3500 atoms of daughter product, how many half lives have passed?

1 half life

2 half lives

3 half lives

4 half lives

there is no way to tell

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.

Advantages and disadvantages of mitigation and adaptation

Which measure of humidity, relative humidity or dew point, best describes the actual quantity of water vapor in a mass of air