The Earth: Its Structure & Its Changes
is a wonderful resource book that will enhance any homeschooler's (or science-loving parent) lessons. Geared for 3rd-6th graders, this book is chock full of information and experiments to enrich the readings.
Each "lesson" is divided into Investigations, which are about 4 pages in length. Included in each Investigation includes a project, readings, and questions to help children "dig a little deeper" in their knowledge of science.
In this series, the following themes are covered (but not limited to): composition of the earth; earthquakes; volcanoes; folding and faulting; mapping a mountain; crystals; minerals; rocks; physical and chemical weathering; caves, sinkholes, and geysers; glaciers.
The projects call for mainly items that you have around your house, except maybe for the rocks' lessons.
Overall, I recommend this book. If you're a homeschooling parent, this would be a great enrichment tool. Also, there are other books similar to this, such as "Forces & Motion," "Matter," and "Energy." If you're a parent of a school student, this also would be a great reinforcement for what's learned in school.