20:17

Identifying Igneous Rocks -- Earth Rocks!

16:04

Identifying Minerals -- Earth Rocks!

17:04

Exploring Rocks and Minerals

11:56

Water Molecule Shape

7:53

15) Feldspars and Quartz

15:51

Folds and Faults

3:10

Identifying Minerals -- Addendum -- Earth Rocks!

14:24

Groundwater