I love to co-teach, and it was really fun to come into a 2nd grade class as the guest art teacher! I have 3 resource students in the class, and I appreciate getting to know their whole class. Hill of Fire, byThomas P. Lewis, is a very readable and interesting beginning chapter book, that all children find ways to connect with. It is a true historic event that happened in Mexico, and anything that has to do with volcanoes is appealing to 2nd graders!
I have literature/guided reading unit for Hill of Fire:
and a volcano directed drawing/painting lesson:
And here's a tip: Use watercolor paper, and the colors with pop!