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Convection currents are circular movements of fluid driven by temperature differences. In Earth's mantle, convection currents occur in the asthenosphere, which is the semi-solid layer beneath the lithosphere. These currents play a significant role in plate tectonics and the movement of Earth's crustal plates.
Under conditions of standard temperature and pressure convection is not possible in the solid state of matter.However under extreme conditions (e.g. the high temperature and pressure in the earth's mantle) convection is not only possible in the solid state of matter, but happens all the time just as in the liquid and gas states of matter but much slower.
A convection boundary is the boundary at which heat or energy is transferred through convection, which is the movement of fluids (liquids or gases) due to temperature differences. This boundary marks the area where the fluid in contact with a solid surface gains or loses heat through convection.
Sodium can occur as a salt in a crystalline solid
Any reaction occur in solid state.