4

Volcanoes

4

Extreme Earth

4

Chip's Tips on Chile

3

Trenches of the World

4

Maddy's Wyoming Diary

4

Edinburgh Castle, Edinburgh, Scotland

4

Mount Fuji, Japan

3

Caves of the World

3

Rocks and Minerals

4

Mount Kilimanjaro, Tanzania

3

Edmund Hillary

4

Maddy's Oregon Diary

3

Valleys of the World

3

Mercury

4

Maddy's Washington Diary

4

Extreme Weather

3

Archipelagos of the World

3

Jupiter

4

The Giant's Causeway, Ireland

4

Chip's Tips on Rwanda

4

Chip's Tips on New Zealand

4

Ngorongoro Crater, Tanzania

4

Chip's Tips on Papua New Guinea

3

Islands of the World

3

Mars

1

Alphabet

3

Venus