3

Valleys of the World

2

Flowers

4

Chip's Tips on Nigeria

4

Maddy's Massachusetts Diary

3

Trenches of the World

4

Maddy's Utah Diary

4

Lake Malawi, Malawi

4

Maddy's Oklahoma Diary

4

Chip's Tips on The Dominican Republic

3

Comets

4

Maddy's West Virginia Diary

4

Maddy's Indiana Diary

4

Maddy's South Dakota Diary

3

May Day

3

Sinkholes of the World

4

Chip's Tips on Mexico

4

Tornadoes

4

Maddy's New Hampshire Diary

3

Fjords of the World

3

Amazing Earth - Part 1

4

Chip's Tips on United States

4

Maddy's California Diary

4

Maddy's Minnesota Diary

4

Chip's Tips on Zambia

3

Amazing Earth - Part 2

4

The American Revolution

4

Maddy's Idaho Diary

2

Landforms

4

Chip's Tips on Honduras

3

Canyons of the World