Cobbles, Gravel, Sand, ... Oh My!
This book is available for download with iBooks on your Mac or iOS device, and with iTunes on your computer. Books can be read with iBooks on your Mac or iOS device.
Here is an Earth Science Project that is fun and educational. It has been tried out by hundreds of kids from the 3rd grade on up. It can be used for the classroom or the home, either way, your kids will have fun!