Which geographic factor led to the formation of Iceland's rugged terrain?

Glaciers and Volcanic activity.

Explanation:

Iceland is a volcanic island in a cold region. It was covered by icy glaciers in the last ice age.

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i would say your answer would be the second option.

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john maynard keynes developed new economic theories in response to the stock market crash of 1929. great depression of the 1930s. first and second world wars. economic boom of the 1950s.