definition: this is the subsoil. it contains many minerals deposits, iron oxide and calcium carbonate, from layers above. whats the term?

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.

there are no components of a physical goal mentioned on the list of choices that you've provided.

answer a fan shaped mass of sediment deposited at the base of a mountain front do to an abrupt change in stream gradient;