Learn about volcanic ash and watch a visualization of the Calbuco volcano to see how ash travels around the world. 

Compare pictures of different volcanoes. Then visit NASA's Space Place to learn about volcanoes and answer questions about volcanic eruptions.

Students will describe the changes in a newly-formed volcanic island over the first three years of its life.  

In this activity, students make a claim about the cause of ocean currents and then develop a model to explain the role of temperature and density in deep ocean currents.  This lesson is modified from "Visit to an Ocean Planet" Caltech and NASA/Jet Propulsion Laboratory.