Bedrock and River Sediment Shape Maine's Contrasting Coastlines

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Maine's coastline displays a striking split in character on either side of Portland. West of the city, sandy shorelines dominate, while the northeastern coast turns rocky and jagged. NASA highlights that variations in underlying bedrock geology are a key factor driving this difference. The way rivers carry and deposit sediment also plays a significant role in shaping the smoother western shores. Together, these natural processes explain why two stretches of the same state's coast look so distinct from each other.

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