4

U.S.S. Arizona Memorial at Pearl Harbor

4

Chip's Tips on Equatorial Guinea

3

Mercury

3

Martin Luther King, Jr.

3

All About History

4

Chip's Tips on Yemen

4

Savanna

4

Taiga

4

Father's Road Trip

2

Warm Grasslands! Savanna

4

Montane Forest

4

Chip's Tips on Oman

4

Chip's Tips on Qatar

4

The Pygmy People

4

Steppe

4

Maddy's Washington, D.C. Diary

4

Father's Road Trip

4

Famous Americans: Abraham Lincoln

2

Country Flags of Africa

4

Famous Americans: Thomas Jefferson

4

Maddy's North Carolina Diary

4

Chip's Tips on United States

4

Tropical Rainforest

3

Mars

4

Mount Rushmore

3

Friction

4

Washington Monument

4

Deciduous Forest

4

Maddy's Missouri Diary

2

Treeless Plains! Steppe