One of the most important challenges in teaching geology is bringing the outside world into the classroom. During a pandemic, obviously, an inability to safely bring students into the classroom doesn’t make that any easier. Fortunately, digital tools can provide new ways to access the world beyond whichever room you find yourself in.
Geology is a very spatial science and can require a lot of 3-D visualization. Simple physical models (not to mention rocks) have long been used to aid teaching about things like faults or crystalline mineral structure.