Who led the expedition that surveyed america's new louisiana purchase?

William Clark & Meriwether Lewis

Explanation:

This expedition is commonly known as the "Lewis & Clark Expedition", and was an expedition in an attempt to map out most of the Louisiana Purchase. The Expedition left the US on a water route that led them to present-day Washington (state), meeting and establishing relationships with the native people along the way, as well as taking geographical and environment note of their surroundings.

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this forms a narrow, steep sided inlet (sometimes deeper than 1300 metres) connected to the sea. the terminal moraine pushed down the valley by the glacier is left underwater at the fjord’s entrance, causing the water at the neck of the fjord to be shallower than the main body of the fjord behind it.