Sand! What is sand? There's glacial sand, calcareous sand, quicksand, glass sand, moulding sand, polishing sand, building sand, filter sand, furnace sand and more.
You'll learn what sand is and where it comes from. You'll know the difference between sand and soil. You will be familiar with references to sand in the Scriptures.
You'll see sand under magnification to help you understand terms such as shape, surface, grain size, and grain fracture.
Best of all, is the fun in making your own collection of sands.