A navigable river is one that is both deep and wide enough for _______ to use.

In the 1800's, people discovered _______ at Red Mountain in Alabama.

A fall line is an _______ line at the point where rivers drop from higher land to lower land.

Cotton plants need plenty of _______ and six months of warm _______.

The Southeast has a long _______ and many rivers.

An industry is all the _______ that produce one kind of good or provide one kind of service.

The edge of the Piedmont drops sharply at this point. As rivers flow over this drop, they form _______.

For early _______ in the Southeast, the fall line was a problem.

A tornado is a violent windstorm whose center is a cloud in the shape of a _______.

Most rivers flow from time to time, but floods become dangerous when people _______ and _______ on floodplains.

Elevation affects _______, as well. Travel in the lowlands is _______ and easier.

In the 1800's, cotton was the _______ crop grown in the Southeast.

They build sawmills, flour mills, and workshops that ran on _______.

The port of Miami is the _______ of the world.