3

Police Officer

4

Niagara Falls

3

Motion

3

Meteorites, Meteoroids, and Meteors

3

Neil Armstrong

2

Who Works Here?

2

Lake Day

4

How they Work? Trains

3

Firefighter

4

Victoria Falls, Zimbabwe/Zambia

4

Gorillas and Other Primates

4

Okavango Delta, Botswana

3

Comets

3

Astronauts

3

Space Exploration

3

Pollution

3

Bus Driver

4

Maddy's New Hampshire Diary

4

Felix's Independence Day

4

Mount Fuji, Japan

4

Hoover Dam