write a 5 Sentence summary, about how the work of various scientists, physicist, astronomers, seismologist, etc. have contributed to the understanding of the layers of the Earth.

answer: option c. i.e. electric current flowing “downhill” from the negative electrode to the positive electrode in a battery

explanation:

the water analogy to the circuits define the pipes (water flows) to the electric current. now, we know that the electric current flows from the positive terminal to the circuit (as shown in the diagram attached).

hence, option c is the correct answer.

see earlier