Which term is used by geologists to identify the time interval between the passage of successive wave crests or troughs?

the answer is a i had that before

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question - how does mountainous terrain affect settlements in a region? choose all answers that are correct.

groups trade with each other regularly.

people travel from settlement to settlement.

why: since they travel to go trade or visit it may be harder to get there because of the mountainous terrain.

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answer at the divergent plate boundary in the middle of the ocean;