4

Stonehenge, England

4

Canterbury Cathedral, Canterbury, England

4

Hadrian's Wall, England

4

Windsor Castle, England

3

Inertia

4

From the American Revolution to the Civil War

3

William Shakespeare

3

Lazy Jack

3

Momentum

3

Rivers of the World

3

Charles Darwin

3

Power

4

Maddy's Maine Diary

3

Force

3

May Day

3

Pressure

3

Harbors of the World

3

Chinese New Year

3

The Old Lady and Her Pig

3

Stealing Sally

3

Isaac Newton

3

The Old Lady and Her Pig

3

Mahatma Gandhi

4

The Anglo-Saxon Invasion of Britain

4

The American Revolution

3

Daniel Boone

3

Florence Nightingale

4

Buckingham Palace, London

3

Stealing Sally

3

Meteorites, Meteoroids, and Meteors