What is the difference between

rocks and minerals?

How are rocks formed?

Help Rex solve the

Mystery of the

Floating Rock

How do we identify

rocks and minerals?

Moh's Hardness Scale

Mineral Encyclopedia

Are you a rock expert?

Learn about 12 popular rocks,

then test your knowledge.

Use Little Explorers Dictionary,

and take the

Rocks and Minerals Quiz

Mine Games from the

San Diego

Natural History Museum

Learn about soil,

weathering, and erosion