Electricity from rivers is called

The major danger that coal miners face today is

The use of skills, ideas, and tools to meet people's needs is

More than half of our country's comes from power plants that burn coal

These are small rivers that feed into the Mississippi River

Wetland areas provide a home for many

Burning coal the air

This is the longest river on the Earth

A type of flat-bottomed sailboat that carries pottery, grain, limestone and passengers.

The Nile flows north toward the

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