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<Content><CHAT_MEDIA><SESSION>What%20;are%20;bluffs%20;?&#10;&gt;&gt;%20;The%20;bluff%20;is%20;formed%20;when%20;the%20;spurs%20;are%20;cut%20;off%20;by%20;lateral%20;erosion%20;of%20;the%20;river%20;water.&#10;&lt;&lt;%20;What%20;is%20;lateral%20;ersion%20;?&#10;&gt;&gt;%20;Lateral%20;erosion%20;is%20;when%20;the%20;river%20;erodes%20;the%20;sides%20;of%20;the%20;valley%20;to%20;become%20;wider.</SESSION></CHAT_MEDIA></Content>