Which part of the mantle convection process is likely to be occurring at the boundary between the Somali plate and the Australian plate? a. hot, rising rock in the mantle
b. cooler, sinking rock in the mantle
c. mantle rock moving horizontally beneath the crust​

car a and b are moving in opposite directions

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adding a(n) to an electric circuit would increase the magnetic field around a wire;

b. solenoid

a solenoid is a type of electromagnet whose purpose is to generate a controlled magnetic field.

if the purpose of the solenoid is instead to impede changes in the electric current, a solenoid can be more specifically classified as an inductor rather than an electromagnet.