4

U.S.S. Arizona Memorial at Pearl Harbor

4

Chip's Tips on Equatorial Guinea

4

Famous Americans: Thomas Jefferson

4

Maddy's Washington, D.C. Diary

4

Savanna

4

Chip's Tips on Oman

4

Maddy's Missouri Diary

3

All About History

3

Mars

4

Father's Road Trip

4

Chip's Tips on United States

4

Washington Monument

4

Steppe

4

Taiga

4

Tropical Rainforest

2

Warm Grasslands! Savanna

4

The Pygmy People

4

Father's Road Trip

3

Friction

4

Montane Forest

2

Treeless Plains! Steppe

3

Martin Luther King, Jr.

4

Chip's Tips on Yemen

4

Mount Rushmore

2

Four Seasons! Deciduous Forest

3

Venus

3

Mercury

2

Country Flags of Africa

4

Deciduous Forest

4

Chip's Tips on Qatar