During our rock unit rather than write in science journals I am asking students to record observations in Educreations. The unit we are working on involves a lot of comparing and observing of rocks, not a lot of action. I think that makes it perfect for an iPad activity because in past years students have become very bored by the 4th or 5th worksheet asking them to describe what they see. They have observed various igneous rocks dry, wet rocks, river rocks, and done a lot of sorts. Here's a sample of an Educreations video created after observing 3 types of igneous rocks.