This paper plate activity would be a great way to introduce different landforms. This would be great to make at the beginning of the unit so that as you go through the unit you could refer to different landforms on students' plates.
Freebie to help you- Rock your Blocks Center! Just add felt or foam pieces to your block center to create interactive maps. Kids can learn map skills, explore communities and community helpers, and practice a number of math and literacy skills!
Geography Printables and Hands-On Materials for Kids - Montessori Land & Water Continent Maps