The Saint Lawrence seaway allow ships to move from one water level to another through a system of locks canals and dams the Saint Lawrence seaway is an example of how people have modified the physical environment what was likely the reason for changing the environment in building the Saint Lawrence seaway

It allows goods to be shipped easily between the United States and Mexico.

It allows goods to be shipped easily between the United States and Canada.

It ended tariffs.

It helped the environment

Explanation: give me brainliest please

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early settlements on the subcontinent. both the indus and the ganges rivers carried rich silt from the mountains to the plains. when the rivers flooded, the silt spread over the plains and made the soil in the river valleys fertile for farming.