Which statements describe the st. lawrence seaway?

the st. lawrence seaway connects the st. lawrence river with the arctic ocean.
the st. lawrence seaway is important for canadian and u. s. trade.
the st. lawrence seaway provides an important trading route for the u. s, but has little value for canada.
the st. lawrence seaway connects the great lakes, the st. lawrence river, and the atlantic ocean.

-The St. Lawrence Seaway connects the Great Lakes, the St. Lawrence River, and the Atlantic Ocean.

-The St. Lawrence Seaway is important for Canadian and U.S. trade.

Explanation:

The Saint Lawrence Seaway is a waterway formed by locks, canals and waterways connecting the Great Lakes and the Saint Lawrence River to the Atlantic Ocean. Its construction between 1954 and 1959 was a huge testament to the art of civil engineering.  

The waterway is 3,774 kilometers long and stretches from Saint Lawrence Bay to the bottom of Lake Superior. The route carries between 30 and 40 million tonnes of freight per year and is of major economic importance to both Canada and the United States.

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