4

Canterbury Cathedral, Canterbury, England

3

The Old Lady and Her Pig

3

Gravity

3

St. Patrick's Day

4

From the American Revolution to the Civil War

3

Lazy Jack

3

Meteorites, Meteoroids, and Meteors

4

Money

3

Pressure

4

Maddy's Delaware Diary

3

Chinese New Year

3

Force

3

The Old Lady and Her Pig

3

Stealing Sally

3

Motion

3

Malala Yousafzai

4

Buckingham Palace, London

3

Thanksgiving Day

3

Team Sports

3

Christopher Columbus

3

William Shakespeare

4

The American Revolution

3

Harbors of the World

3

Rivers of the World

3

May Day

3

Straits of the World

3

Florence Nightingale

4

The Anglo-Saxon Invasion of Britain

3

Inertia

3

Isaac Newton