3

Meteorites, Meteoroids, and Meteors

4

Dr. Why-Physics

3

The Jeweled Frog and the Mighty Condor

3

Mars

3

Magnetism

4

Maddy's Wisconsin Diary

3

The Jeweled Frog and the Mighty Condor

3

Asteroids

3

Light

3

Neptune

2

Jack's Sack

4

Maddy's New York Diary

4

Money