North America, the _____________ continent, extends from the tiny Aleutian Islands in the northwest to the Isthmus of Panama in the south.

Which of the following is NOT a part of North America?

A ___________  is a community of animals and plants spreading over an extensive area with a relatively uniform climate.

The most familiar of these mountains are probably the ________________, North America’s largest chain.

The _______________ stretch from the southwestern United States to Honduras.

Much of this region is known for strong volcanic activity and earthquakes.

In addition to mountains, deserts, and forests, the northern part of the western region of North America also has the richest deposits of ______________ on the continent. Most of these deposits are located offshore, in the Arctic and Pacific Oceans.

The ____________ lie in the middle of the continent. Deep, rich soil blankets large areas of the plains in Canada and the United States.

The most recent glacial period is known as “____________ .”

The ____________  is characterized by permafrost—soil that is frozen for two or more years.

The  _____________  is the largest wetland system in the United States, covering more than 11,137 square kilometers (4,300 square miles).

_____________ areas are a biome of the eastern region and consist of areas of land whose soil is saturated with permanent or seasonal moisture.

The Caribbean Region includes more than 8,000 islands, islets, reefs, and cays.

_________________ are made of millions of tiny animals—corals—that form a hard shell around their bodies.

The ________________, at 3,730 kilometers (2,320 miles) long, is one of the longest river systems in the world.