4

Eire of the Desert

2

Hot and Dry! Desert

4

Desert

4

Eire of the Desert

4

Maddy's Nevada Diary

3

The Winklers' Holiday on Zoo Lovers Day

3

The Winklers' Holiday on Zoo Lovers Day

4

Petra, Jordan

4

Sossusvlei Dunes, Namibia

4

Chip's Tips on Ghana

4

Timbuktu, Mali

4

Maddy's California Diary

4

Patsy and Paul at Uluru in Australia

4

Chip's Tips on India

3

Mars

4

Maddy's Arizona Diary

4

Chip's Tips on Chile

4

Chip's Tips on Nigeria

2

Ecosystems

4

Chip's Tips on China

4

Maddy's Washington Diary

4

Maddy's Utah Diary

3

Marco Polo

4

Chip's Tips on Egypt

3

Coastal Plains of the World

4

Maddy's New Mexico Diary

4

Chip's Tips on Botswana

4

Maddy's Oregon Diary

4

Hoover Dam

3

Valleys of the World