I recently created or updated my activities for secondary and university students focused on the following themes, indicating starting point links for each. It is my hope that these activities, data layers, and interactive maps are useful to many educators and students. I have also compiled a "why and how to use GIS in education" set of slides to use as an introduction to these lessons and activities as an attachment to this blog essay.
Change over space and time
Create a terrain profile
Create a viewshed
Create a trace downstream
New Zealand Purchasing Power (log in required)
Weather and Climate
Real-time weather analysis (log in required)