4

Desert

2

Hot and Dry! Desert

4

Eire of the Desert

4

Eire of the Desert

4

Chip's Tips on Ghana

3

Continents of the World

4

Ecosystems Level 4

4

Chip's Tips on Chile

4

Chip's Tips on Nigeria

4

Sossusvlei Dunes, Namibia

4

Chip's Tips on India

4

Sphinx, Egypt

4

Maddy's Nevada Diary

4

Hoover Dam

3

The Mystery of the Fairy Circles

4

Chip's Tips on China

4

Maddy's New Mexico Diary

4

Petra, Jordan

4

Timbuktu, Mali

3

Valleys of the World

3

David Livingstone

3

Coastal Plains of the World

4

Okavango Delta, Botswana

4

Maddy's Oregon Diary

2

Ecosystems

4

Maddy's California Diary

3

Marco Polo

3

The Winklers' Holiday on Zoo Lovers Day

4

Maddy's Arizona Diary

4

Chip's Tips on Yemen