Mountains that are formed between two large faults are known as what? ?

d. new methods of assembly are introduced.

explanation:

this allows for the goods to be made on a larger scale. not faster because now it is shown to be made better, hence the greater productivity in the question. it is calling for something new to be introduced.

they were destroyed coming out of the civil war but after he war they were booming. if you need an in-depth answer follow up with me  

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