I think it’s 4. The spinning of the core producing the Earth’s magnetic field.
The chief executive is the president The president is Someone who’s in leader of this country mainly
Answer:
B/river
Explanation:
because hydrosphere is formed from water and so is river
(1) its [e] social customs
(2) its [b] pollution pestilence
(3) its [c]
(4) its [e]
(5) its [d]
(6) its [d]
(7) its [e]