D, It is a flow of protons, is the best answer. Electricity is the flow of electrons, not protons.
There is a special temperature for every substance called the melting point. When a solid reaches the temperature of its melting point, it can become a liquid.
The correct answer is C) A substance changes color when heated, but changes back when cooled. Hope this helps.
Answer:
Bohrium (Niels Bohr)
Curium (Marie and Pierre Curie)
Einsteinium (Albert Einstein
Earth's magnetic field doesn't have much to do with tectonic plates. But both are caused by movement of the magma. The magnetic field is caused by electrical currents flowing in the magma, roughly parallel with the Equator. Tectonic plates move around the surface of the Earth over the liquid magma.
So I'd go with B. mantle convection currents
