3

The Earth

4

Earthquakes

3

Bays of the World

3

Saturn

4

Mount Fuji, Japan

2

Water Everywhere! Aquatic

3

Wetlands of the World

2

Hilarious Times with Nursery Rhymes

4

Amphibians

4

Belém Tower, Portugal

3

Oceans and Seas of the World

3

Zuri's Launch

3

The Universe

3

Gravity

3

Venus

4

Polar

4

Tornadoes

3

Jupiter

3

Valleys of the World

4

Tropical Rainforest

3

Fjords of the World

3

Islands of the World

2

Four Seasons! Deciduous Forest

3

Mars

2

Evergreen Forests! Taiga

4

Maddy's Ohio Diary

3

Gulfs of the World

4

Chip's Tips on New Zealand

3

Caves of the World

2

Respect