The iron in the stones of the Grand Canyon turn the color of red is it Mechanical Weathering or Chemical Weathering

Mechanical weathering occurs when water drips or flows over rock for prolonged periods; the Grand Canyon, for example, was formed to a large degree by the mechanical weathering action of the Colorado River. Chemical weathering occurs when water dissolves minerals in a rock, producing new compounds.

costa rica canal

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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.