Rivers were used for trade with other cities and countries, for transportation, and for food and sustenance, among other things.
The sentence "others refer to them as giant rivers of ice" is in the present tense. The past tense would have used referred, the future tense would have used, will refer.
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Lakes and rivers are used for drinking water.
Rivers have been used by humans for transportation, providing easy access to different regions. They have also been utilized for irrigation to support agriculture and provide water for drinking and livestock. Additionally, rivers have served as a source of food through fishing and as a renewable energy source for powering mills and other machinery.
The rivers were used for fishing, transportation, baths, and drinking water. Also for trading.
The rivers have bean used fur a long time!
Nate rivers
Tributaries
Canals and navigable rivers are used extensively in Germany for transporting goods.
Illinois rivers are used for sports fishing. Some are used for barge traffic.http://www.mvr.usace.army.mil/Missions/Navigation.aspx
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Lakes and rivers were used for transportation,drinking,and bathing in pioneer times.