My students will not have much familiarity with what an actual launch pad looks like or why it is designed the way that it is.  I would like my students to use the primary source analysis tool on the picture of the launch pad start a discussion about what they see, why they think things look the way they do, then have that lead into a lesson on what the different parts of a launch pad are and what their purpose is.  Other photos can also be used to show kids different perspectives of the launch pad as well, not just the one provided here.