Rock collecting has never been quite like this! When the class forgets to do its homework, a field trip through the Earth's crust, into the center of the Earth, and out through a volcano will teach them not to forget their assignments again--and then some!
Read More
Rock collecting has never been quite like this! When the class forgets to do its homework, a field trip through the Earth's crust, into the center of the Earth, and out through a volcano will teach them not to forget their assignments again--and then some!
Read Less
