Gravitational forces result in the fusion of small atoms. A differentiated iron core expresses magnetic properties. Currents redistribute heat in an unevenly heated liquid. A stream of charged ions disperses lightweight gases.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which of the following is a crucial piece of evidence supporting scientists' theory of how the continents and the ocean basins formed?
Possibilities:
- Gravitational forces result in the fusion of small atoms.
- A differentiated iron core expresses magnetic properties.
- Currents redistribute heat in an unevenly heated liquid.
- A stream of charged ions disperses lightweight gases.

Currents redistribute heat in an unevenly heated liquid.