Don’t be fooled by its familiar simplicity -- A hill’s structure is unique -- and POWERFUL. It can move Ancient Obelisks, or obliterate cities through landslide. Without the qualities of a hill, the natural world would be flat.
Introduce your students to the Physics of Earth/Solid particulates -- gravel, silt, loam, clay, sand, etc. -- that make up most hills. Because solid particulate flows like water, it displays interesting attributes involving motive forces and gravity.
Since solid p