2

Country Flags of South America

3

Isthmuses of the World

3

Straits of the World

3

Archipelagos of the World

4

The Quechua People

4

Patsy and Paul at Machu Picchu in Peru

3

Amerigo Vespucci

3

Eid al-Fitr

3

Fjords of the World

3

Continents of the World

3

Glaciers of the World

4

Gorillas and Other Primates

3

Coastal Plains of the World

3

Simon Bolivar

3

Charles Darwin

3

Valleys of the World

2

Colo and Theo Go to the Beach

4

Chip's Tips on Chile

4

Early Native Americans

4

Amphibians

3

Christopher Columbus

3

Trenches of the World

3

Canyons of the World

4

Chip's Tips on Venezuela

3

Capes and Peninsulas of the World

3

Sinkholes of the World

2

Colo and Theo Go to the Beach

3

Drainage Basins of the World

4

The Plains Indians People

4

Chip's Tips on Brazil