Which best describes the convection currents in earth’s mantle?

Answer;

The convection currents transfer thermal energy away from Earth's core toward its crust.

Explanation;Convection currents are the circular pathways taken by a fluid that enhances heat transfer by the process known as convection which occurs in fluids. Convection currents transfer heat from one place to another by mass motion of a fluid.Earth mantle is in a semi-liquid state and behaves like any other fluid, rising up from the bottom of the mantle after becoming hotter and less dense from heat of the earth's core, as the rock loses heat into the earth's crust it becomes cooler and more dense, then sinking back down to the core, then repeating the cycle.

The charge of an ion with 55 protons and 52 electrons is +3. the reason is because protons are positive, and there are three more than the amount of negative electrons.