The use of robots and how they help build cars and how the assembly line has improved from the 1900's would be my answer.
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Answer:
Assuming you mean ocean ridges, it would be D.
Explanation:
A mid-ocean ridge is formed by seafloor spreading. New ocean crust is formed by magma getting pushed up. The plates move away from each other so the crust would have room to form.
I have attached a picture of the process for visual explanation.
Answer: It was the imaginary line dividing Europe between the Soviet Union and Western influence.
Explanation: This symbolized efforts by the Soviet union to block itself from open contact with the West